Academic article

• Aadland, Eivind; Kvalheim, Olav Martin (2025). Are associations between physical activity and lipoproteins in children moderated by fitness and fatness?. (external link)
• Aadland, Eivind; Kvalheim, Olav Martin; Haugland, Elisabeth Straume et al. (2025). Investigating between-group effects of a physical activity intervention across the physical activity intensity spectrum using multivariate pattern analysis. (external link)
• Kvalheim, Olav Martin; Andersen, Lars Bo; Aadland, Eivind (2025). An approach to determine the net predictive multivariate association pattern between cardiorespiratory fitness and a high-resolution physical activity spectrum in the presence of multicollinear covariates. (external link)
• Fanjara, Ernestine; Arneberg, Reidar; Kvalheim, Olav Martin et al. (2025). A Colorimetric Approach for Detecting a Selected Fecal Cortisol Metabolite as a Stress Biomarker in Atlantic Salmon. (external link)
• Kvalheim, Olav Martin; Vidar, Warren S.; Baumeister, Tim U. H. et al. (2024). Implications of confounding from unmodeled interactions between explanatory variables when using latent variable regression models to make inferences. (external link)
• Baumeister, Tim U. H.; Aadland, Eivind; Linington, Roger G. et al. (2024). Multivariate pattern analysis: a method and software to reveal, quantify, and visualize predictive association patterns in multicollinear data. (external link)
• Kvalheim, Olav Martin; Rajalahti, Tarja (2024). Omega-3 Marine Fatty Acid Supplementation to Healthy Subjects Interacts With Moderate Physical Activity to Provide a Cardiovascular Healthier Lipoprotein Subclass Profile. (external link)
• Kvalheim, Olav Martin; Rajalahti, Tarja; Aadland, Eivind (2022). An approach to assess and adjust for the influence of multicollinear covariates on metabolomics association patterns-applied to a study of the associations between a comprehensive lipoprotein profile and the homeostatic model assessment of insulin resistance. (external link)
• Jones, Paul Remy; Rajalahti, Tarja; Resaland, Geir Kåre et al. (2022). Associations of lipoprotein particle profile and objectively measured physical activity and sedentary time in schoolchildren: a prospective cohort study. (external link)
• Vidar, Warren S.; Baumeister, Tim U. H.; Caesar, Lindsay K. et al. (2022). Interaction Metabolomics to Discover Synergists in Natural Product Mixtures. (external link)
• Dempsey, Paddy C.; Aadland, Eivind; Strain, Tessa et al. (2022). Physical activity intensity profiles associated with cardiometabolic risk in middle-aged to older men and women. (external link)
• Rajalahti, Tarja; Aadland, Eivind; Resaland, Geir Kåre et al. (2021). Influence of adiposity and physical activity on the cardiometabolic association pattern of lipoprotein subclasses to aerobic fitness in prepubertal children. (external link)
• Rajalahti, Tarja; Aadland, Eivind; Resaland, Geir Kåre et al. (2021). Cardiometabolic associations between physical activity, adiposity, and lipoprotein subclasses in prepubertal norwegian children. (external link)
• Migueles, Jairo H.; Aadland, Eivind; Andersen, Lars Bo et al. (2021). GRANADA consensus on analytical approaches to assess associations with accelerometer-determined physical behaviours (physical activity, sedentary behaviour and sleep) in epidemiological studies. (external link)
• Dybsland, Cecilie Sævdal; Bekkby, Trine; Enerstvedt, Kjersti Hasle et al. (2021). Variation in Phenolic Chemistry in Zostera marina Seagrass Along Environmental Gradients. (external link)
• Jones, Paul Remy; Rajalahti, Tarja; Resaland, Geir Kåre et al. (2021). Cross-sectional and prospective associations between aerobic fitness and lipoprotein particle profile in a cohort of Norwegian schoolchildren. (external link)
• Aadland, Eivind; Andersen, Lars Bo; Migueles, Jairo Hidalgo et al. (2020). Interpretation of associations between the accelerometry physical activity spectrum and cardiometabolic health and locomotor skills in two cohorts of children using raw, log-transformed, or compositional data. (external link)
• Kvalheim, Olav Martin (2020). Variable importance: Comparison of selectivity ratio and significance multivariate correlation for interpretation of latent‐variable regression models. (external link)
• Aadland, Eivind; Nilsen, Ada Kristine Ofrim; Andersen, Lars Bo et al. (2020). A comparison of analytical approaches to investigate associations for accelerometry-derived physical activity spectra with health and developmental outcomes in children. (external link)
• Aadland, Eivind; Kvalheim, Olav Martin; Hansen, Bjørge Hermann et al. (2020). The multivariate physical activity signature associated with metabolic health in children and youth: An International Children's Accelerometry Database (ICAD) analysis. (external link)
• Kellogg, Joshua J.; Kvalheim, Olav Martin; Cech, Nadja B. (2020). Composite score analysis for unsupervised comparison and network visualization of metabolomics data. (external link)
• Aadland, Eivind; Andersen, Lars Bo; Anderssen, Sigmund Alfred et al. (2019). Accelerometer epoch setting is decisive for associations between physical activity and metabolic health in children. (external link)
• Aadland, Eivind; Kvalheim, Olav Martin; Anderssen, Sigmund Alfred et al. (2019). Multicollinear physical activity accelerometry data and associations to cardiometabolic health: Challenges, pitfalls, and potential solutions. (external link)
• Aadland, Eivind; Kvalheim, Olav Martin; Anderssen, Sigmund Alfred et al. (2019). The triaxial physical activity signature associated with metabolic health in children. (external link)
• Jones, Paul Remy; Rajalahti, Tarja; Resaland, Geir Kåre et al. (2019). Associations of physical activity and sedentary time with lipoprotein subclasses in Norwegian schoolchildren: The Active Smarter Kids (ASK) study. (external link)
• Aadland, Eivind; Andersen, Lars Bo; Resaland, Geir Kåre et al. (2019). Interpretation of multivariate association patterns between multicollinear physical activity accelerometry data and cardiometabolic health in children-a tutorial. (external link)
• Kvalheim, Olav Martin; Grung, Bjørn; Rajalahti, Tarja (2019). Number of components and prediction error in partial least squares regression determined by Monte Carlo resampling strategies. (external link)
• Caesar, Lindsay K.; Kellogg, Joshua J.; Kvalheim, Olav Martin et al. (2019). Opportunities and limitations for untargeted mass spectrometry metabolomics to identify biologically active constituents in complex natural product mixtures. (external link)
• Caesar, Lindsay K.; Kvalheim, Olav Martin; Cech, Nadja B. (2018). Hierarchical Cluster Analysis of Technical Replicates to Identify Interferents in Untargeted Mass Spectrometry Metabolomics. (external link)
• Aadland, Eivind; Kvalheim, Olav Martin; Anderssen, Sigmund Alfred et al. (2018). The multivariate physical activity signature associated with metabolic health in children. (external link)
• Kvalheim, Olav Martin; Arneberg, Reidar; Grung, Bjørn et al. (2018). Determination of optimum number of components in partial least squares regression from distributions of the root‐mean‐squared error obtained by Monte Carlo resampling. (external link)
• Britton, Emily R.; Kellogg, Joshua J.; Kvalheim, Olav Martin et al. (2018). Biochemometrics to Identify Synergists and Additives from Botanical Medicines: A Case Study with Hydrastis canadensis (Goldenseal). (external link)
• Resaland, Geir Kåre; Rajalahti, Tarja; Aadland, Eivind et al. (2018). Strong association between cardiorespiratory fitness and serum lipoprotein subclass pattern in prepubertal healthy children. (external link)
• Aadland, Eivind; Andersen, Lars Bo; Anderssen, Sigmund Alfred et al. (2018). Associations of volumes and patterns of physical activity with metabolic health in children: A multivariate pattern analysis approach. (external link)
• Caesar, Lindsay K.; Kellogg, Joshua J.; Kvalheim, Olav Martin et al. (2018). Integration of Biochemometrics and Molecular Networking to Identify Antimicrobials in Angelica keiskei. (external link)
• Aadland, Eivind; Kvalheim, Olav Martin; Rajalahti, Tarja et al. (2017). Aerobic fitness and metabolic health in children: A clinical validation of directly measured maximal oxygen consumption versus performance measures as markers of health. (external link)
• Kellogg, Joshua J.; Graf, Tyler N.; Paine, Mary F. et al. (2017). Comparison of metabolomics approaches for evaluating the variability of complex botanical preparations: green tea (Camellia sinensis) as a case study. (external link)
• Lin, Chenchen; Rajalahti, Tarja; Mjøs, Svein Are et al. (2016). Predictive associations between serum fatty acids and lipoproteins in healthy non-obese Norwegians: implications for cardiovascular health. (external link)
• Rajalahti, Tarja; Lin, Chenchen; Mjøs, Svein Are et al. (2016). Serum fatty acid and lipoprotein subclass concentrations and their associations in prepubertal healthy Norwegian children. (external link)
• Resaland, Geir Kåre; Aadland, Eivind; Moe, Vegard Fusche et al. (2016). Effects of physical activity on schoolchildren's academic performance: The Active Smarter Kids (ASK) cluster-randomized controlled trial. (external link)
• Lin, Chenchen; Andersen, John Roger; Våge, Villy et al. (2016). Intensive lifestyle intervention provides rapid reduction of serum fatty acid levels in women with severe obesity without lowering omega-3 to unhealthy levels. (external link)
• Rajalahti, Tarja; Lin, Chenchen; Mjøs, Svein Are et al. (2016). Changes in serum fatty acid and lipoprotein subclass concentrations from prepuberty to adulthood and during aging. (external link)
• Kellogg, Joshua J.; Todd, Daniel A.; Egan, Joseph M. et al. (2016). Biochemometrics for Natural Products Research: Comparison of Data Analysis Approaches and Application to Identification of Bioactive Compounds. (external link)
• Resaland, Geir Kåre; Moe, Vegard Fusche; Aadland, Eivind et al. (2015). Active Smarter Kids (ASK): Rationale and design of a cluster-randomized controlled trial investigating the effects of daily physical activity on children's academic performance and risk factors for non-communicable diseases. (external link)
• Lin, Chenchen; Våge, Villy; Mjøs, Svein Are et al. (2015). Changes in Serum Fatty Acid Levels During the First Year After Bariatric Surgery. (external link)
• Bleie, Olav; Roberto, Michael F.; Dearing, Thomas I. et al. (2015). Moffat-swern oxidation of alcohols: Translating a batch reaction to a continuous-flow reaction. (external link)
• Kvalheim, Olav Martin; Arneberg, Reidar; Bleie, Olav L. et al. (2014). Variable importance in latent variable regression models. (external link)
• Aadland, Eivind; Andersen, John Roger; Anderssen, Sigmund Alfred et al. (2013). Impact of physical activity and diet on lipoprotein particle concentrations in severely obese women participating in a 1-year lifestyle intervention. (external link)
• Aadland, Eivind; Andersen, John Roger; Anderssen, Sigmund Alfred et al. (2013). Physical activity versus sedentary behavior: associations with lipoprotein particle subclass concentrations in healthy adults. (external link)
• Meling, Siv; Kvalheim, Olav Martin; Arneberg, Reidar et al. (2013). Investigation of serum protein profiles in scrapie infected sheep by means of SELDI-TOF-MS and multivariate data analysis. (external link)
• Kvalheim, Olav Martin (2012). History, philosophy and mathematical basis of the latent variable approach - from a peculiarity in psychology to a general method for analysis of multivariate data. (external link)
• Zhang, Liangxiao; Zhang, Wan; Cao, Dongsheng et al. (2011). Resolving co-eluting chromatographic patterns by means of dissimilarity analysis in iterative target transformation factor analysis. (external link)
• Kvalheim, Olav Martin; Chan, Hoi-Yan; Benzie, Iris et al. (2011). Chromatographic profiling and multivariate analysis for screening and quantifying the contributions from individual components to the bioactive signature in natural products. (external link)
• Zhang, Liangxiao; Dai, Hui; Liang, Yizeng et al. (2010). Detection and use of selective ions for providing initial estimates of the concentration vectors in iterative target transformation factor analysis. (external link)
• Kvalheim, Tarja Anniki Rajalahti; Kroksveen, Ann Cathrine; Arneberg, Reidar et al. (2010). A multivariate approach to reveal biomarker signatures for disease classification: application to mass spectral profiles of cerebrospinal fluid from patients with multiple sclerosis. (external link)
• Kvalheim, Olav Martin (2010). Interpretation of partial least squares regression models by means of target projection and selectivity ratio plots. (external link)
• Zhang, Liangxiao; Mjøs, Svein Are; Meier, Sonnich et al. (2010). The vector of calibration ratios: A simple transfer method for mass spectra. (external link)
• Chau, Foo-Tim; Chan, Hoi-Yan; Cheung, Chui-Yee et al. (2009). Recipe for Uncovering the Bioactive Components in Herbal Medicine. (external link)
• Kvalheim, Olav Martin; Rajalahti, Tarja; Arneberg, Reidar (2009). X-tended target projection (XTP) - comparison with orthogonal partial least squares (OPLS) and PLS post-processing by similarity transformation (PLS + ST). (external link)
• Rajalahti, Tarja; Arneberg, Reidar; Kroksveen, Ann Cathrine et al. (2009). Discriminating Variable Test and Selectivity Ratio Plot: Quantitative Tools for Interpretation and Variable (Biomarker) Selection in Complex Spectral or Chromatographic Profiles. (external link)
• Rajalahti, Tarja; Arneberg, Reidar; Berven, Frode et al. (2009). Biomarker discovery in mass spectral profiles by means of selectivity ratio plot. (external link)
• Yuan, Dalin; Liang, Yizeng; Yi, Lunzhao et al. (2008). Uncorrelated linear discriminant analysis (ULDA): A powerful tool for exploration of metabolomics data. (external link)
• Liang, Yizeng; Yuan, Dalin; Xu, Qingsong et al. (2008). Modeling based on subspace orthogonal projections for QSAR and QSPR research. (external link)
• Berven, Frode; Kroksveen, Ann Cathrine; Berle, Magnus Foldal et al. (2007). Pre-analytical influence on the low molecular weight cerebrospinal fluid proteome. (external link)
• Flåten, Geir Rune; Botnen, Helge; Grung, Bjørn et al. (2007). Quantifying disturbances in benthic communities - comparison of the community disturbance index (CDI) to other multivariate methods. (external link)
• Arneberg, Reidar; Rajalahti, Tarja; Flikka, Kristian et al. (2007). Pretreatment of mass spectral profiles: Application to proteomic data. (external link)
• Flåten, Geir Rune; Grung, Bjørn; Kvalheim, Olav Martin (2007). A comparison of different pre-treatment procedures for reducing heteroscedasticity and other irrelevant features in data prior to modelling of benthic count profiles. (external link)
• Flåten, Geir Rune; Grung, Bjørn; Kvalheim, Olav Martin (2004). Quantification of pollution levels by multiway modelling. (external link)
• Flåten, Geir Rune; Botnen, Helge; Grung, Bjørn et al. (2004). Assigning environmental variables to observed biological changes. (external link)
• Flåten, Geir Rune; Grung, Bjørn; Kvalheim, Olav Martin (2004). A method for validation of reference sets in SIMCA modelling. (external link)
• Flaten, GR; Grung, Bjørn; Kvalheim, Olav Martin (2004). Quantification of pollution levels by multiway modelling. (external link)
• Flaten, GR; Grung, Bjørn; Kvalheim, Olav Martin (2004). A method for validation of reference sets in SIMCA modelling. (external link)
• Eide, Ingvar; Neverdal, Gunhild; Thorvaldsen, Bodil et al. (2004). Toxicological evaluation of complex mixtures: fingerprinting and multivariate analysis. (external link)
• Idborg-Björkman, H.; Edlund, P.-O.; Kvalheim, Olav Martin et al. (2003). Screening of biomakers in rat urine using LC/MC electrospray ionization-MS and two-way data analysis. (external link)
• Stordrange, Laila; Libnau, Fred Olav; Malthe-Sørensen, Dick et al. (2002). Feasibility study of NIR for surveillance of a pharmaceutical process, including a study of different preprocessing techniques. (external link)
• Stordrange, Laila; Christy, Alfred Anthony; Kvalheim, Olav Martin et al. (2002). Study of the Self-Association of Alcohols by Near-Infrared Spectroscopy and Multivariate 2D Techniques. (external link)
• Ingvar, Eide; Neverdal, Gunhild; Thorvaldsen, Bodil et al. (2002). Toxicological evaluation of complex mixtures by pattern recognition: Correlating chemical fingerprints to mutagenicity. (external link)
• Shen, Hailin; Grung, Bjørn; Kvalheim, Olav Martin et al. (2001). Automated curve resolution applied to data from multi-detection instruments. (external link)
• Midttun, Øyvind; Kvalheim, Olav Martin (2001). Interactions in chromatographic separation of resins from deasphaltened crude oils studied by means of infrared spectroscopy and principal component analysis. (external link)
• Eide, Ingvar; Neverdal, Gunhild; Thorvaldsen, Bodil et al. (2001). Resolution of GC-MS Data of Complex PAC Mixtures and Regression Modeling of Mutagenicity by PLS. (external link)
• Midttun, Øyvind; Kallevik, H.; Sjøblom, J. et al. (2000). Multivarite screening analysis of water-in-oil emulsions in high external electric fields as studied by means of dielectric time domain spectroscopy - III emulsions containing asphaltenes and resins. (external link)
• Kallevik, H.; Hansen, S. B.; Sæther, O. et al. (2000). Crude oil model emulsion characterised by means of near infrared spectroscopy and multivariate techniques. (external link)
• Kallevik, Harald; Kvalheim, Olav Martin; Sjöblom, Johan (2000). Quantitative determination of asphaltenes and resins in solution by means of near-infrared spectroscopy. Correlations to emulsion stability. (external link)
• Shen, Hailin; Liang, Y.; Kvalheim, Olav Martin et al. (2000). Determination of chemical rank of two-way data from subspace comparisons. (external link)
• Shen, Hailin; Storedrange, Laila; Manne, Rolf et al. (2000). Morphological score and its application to chemical rank determination. (external link)
• Christry, Alfred A.; Nyhus, Anne K.; Grung, Bjørn et al. (1998). Friedel-Crafts Acylation on Porous Divinyl Benzene Polymer Particles: A Reaction Kinetic Process Studied by Mid-and Near-Infrared spectroscopy. (external link)
• Førland, Geir Martin; Liang, Yi-Zeng; Kvalheim, Olav Martin et al. (1997). Associative Behavior of Benzyl Alcohol in Carbon Tetrachloride Solutions. (external link)
• Førland, Geir Martin; Liang, Yi-zeng; Kvalheim, Olav Martin et al. (1997). Associative bahaviour of benzyl alcohol in carbon tetrachloride solutions. (external link)
• Sæten, B.G.; Sjöblom, Johan; Toft, J. et al. (1997). Complexation between benzoic acid and fatty amines. An adsorption and chemometric study. (external link)
• Fluge, Øystein; Gilje, K.; Sletten, Einar et al. (1996). Proton nuclear magnetic resonance spectroscopy of serum from patients with colorectal neoplasia. (external link)
• Fluge, Øystein; Gilje, K.; Sletten, Einar et al. (1996). Proton nuclear magnetic resonance spectroscopy of serum from patients with colorectal neoplasia. (external link)
• Fluge, Øystein; Gilje, K.; Sletten, Einar et al. (1996). Proton nuclear magnetic resonance spectroscopy of serum from patients with colorectal neoplasia. (external link)
• Førdedal, Harald; Midttun, Bjørn Øivind; Sjøblom, Johan et al. (1996). A multivariate analysis of w/o emulsions in high external electric fields, as studied by means of dielectric time domain spectroscopy. (external link)
• Førland, Geir Martin; Libnau, Fred Olav; Kvalheim, Olav Martin et al. (1996). Self-Association of Medium-Chain Alcohols in n-Decane Solutions. (external link)
• Massart, B.; Libnau, Fred Olav; Kvalheim, Olav Martin et al. (1996). Projective modelling by SIMCA - a new dynamic strategy for cost-efficient environmental monitoring around offshore installations. (external link)
• Nodland, Egil; Libnau, Fred Olav; Kvalheim, Olav Martin (1996). Resolution of infrared profiles from variable temperature experiments on mixtures and conformers in rapid equilibrum by compensating for thermal and solvent effects. (external link)
• Fluge, Øystein; Gilje, K.; Sletten, Einar et al. (1996). Proton nuclear magnetic resonance spectroscopy of serum from patients with colorectal neoplasia. (external link)
• Førdedal, Harald; Midttun, Bjørn Øivind; Sjøblom, Johan et al. (1996). A multivariate analysis of w/o emulsions in high external electric fields, as studied by means of dielectric time domain spectroscopy. Part II. Model emulsions stabilised by interfacially active fractions from crude oils. (external link)
• Liang, Yi-zeng; Kvalheim, Olav Martin (1996). Methods for multivariate analysis. (external link)
• Nodland, Egil; Libnau, Fred Olav; Kvalheim, Olav Martin et al. (1996). Influence and correction of peak shift and band broadening observed by rank analysis on vibrational bands from variable-temperature measurement. (external link)
• Christy, A. A.; Kvalheim, Olav Martin (1995). Particle size effect on diffuse reflectance spectra: Modification of Kubelka-Munk equation. (external link)
• Barth, Tanja; Seim, M.; Christy, A. A. et al. (1995). Maturity trends in asphaltenes from pyrolysed source rocks and natural coals-Multivariate modelling of diffuse reflectance Fourier transform infrared spectra. (external link)
• Libnau, F. O.; Christy, A. A.; Kvalheim, Olav Martin (1995). Determination of the equilibrium constant and resolution of the HOD spectrum by alternating least squares. (external link)
• Alsberg, B. K.; Kvalheim, Olav Martin (1994). Speed improvement of multivariate algorithms by the method of postponed basis matrix multiplication method. Part 1. Principal component analysis. (external link)
• Alsberg, B. K.; Kvalheim, Olav Martin (1994). Speed improvement of multivariate algorithms by the method of postponed basis matrix multiplication method. Part II. Three-mode principal component analysis. (external link)
• Alsberg, B. K.; Nodland, Egil; Kvalheim, Olav Martin (1994). Compression of an order data arrays by B-splines. Part 2. Application to second- order FT-IR data. (external link)
• Brereton, R. G.; Rahmani, A.; Liang, Yi-zeng et al. (1994). Investigation of the allomerization reaction of chlorophyll a: use of diode array HPLC, mass spectrometry and chemometric factor analysis for the detection of early products. (external link)
• Brakstad, F.; Kvalheim, Olav Martin; Ugland, K. I. et al. (1994). Prediction of the Shannon Wiener index from trace element profiles in sediments around the Statfjord platforms. (external link)
• Libnau, F. O.; Toft, J.; Christy, A. A. et al. (1994). Structure of liquid water determined from infrared temperature profiling and evolutionary curve resolution. (external link)
• Toft, J.; Kvalheim, Olav Martin (1994). Nonlinear curve fitting of bilinear data by ortogonal projections for rank analysis. Applications to GC-IR and temperature IR studies. (external link)
• Libnau, F. O.; Kvalheim, Olav Martin; Christy, A. A. (1994). Spectra of water in the near- and mid-infrared region. (external link)
• Toft, J.; Kvalheim, Olav Martin (1994). Multi-array resolution parameter for multidetection chromatography. Performance of alternating regression, iterative target transformation factor analysis and heuristic evolving latent projections. (external link)
• Grung, Bjørn; Kvalheim, Olav Martin (1994). Rank determination of spectroscopi data by means of cross validation - The effect of replicated measurements on the degrees of fredom. (external link)
• Liang, Yi-zeng; Manne, Rolf; Kvalheim, Olav Martin (1994). Resolution of embedded chromatographic peaks by sequential rank analysis of the firs-order differentiated elution profile in the domiain. (external link)
• Liang, Yi-zeng; Kvalheim, Olav Martin (1994). Diagnosis and resolution of multiwavelength chromatograms by rank map, orthogonal projections and sequential rank analysis. (external link)
• Kvalheim, Olav Martin; Brakstad, F.; Liang, Yi-zeng (1994). Preprocessing of analytical profiles in the presence of homoscedastic or heteroscedastic noise. (external link)
• Christy, A. A.; Kvalheim, Olav Martin; Høiland, Harald (1994). Bulk compositional variations of coal asphaltenes studied by latent variable analysis of infrared microspectroscopic data. (external link)
• Liang, Yi-zeng; Hämäläinen, M. D.; Kvalheim, Olav Martin et al. (1994). Assessment of peak origin and purity by orthogonal design and Heuristic evolving latent projections. (external link)
• Libnau, F. O.; Christy, A. A.; Kvalheim, Olav Martin (1994). Resolution of infrared spectra and kinetic analysis of mutarotation of D-Glucose in water by sequential rank analysis. (external link)
• Alsberg, B. K.; Kvalheim, Olav Martin (1994). Compression of three-mode data arrays by B-splines prior to three-mode principal component analysis (PCA). (external link)
• Christy, A. A.; Nodland, Egil; Kvalheim, Olav Martin (1994). Determination of kinetic parameters for the dehydration of calcium oxalate monohydrate by diffuse reflectance infrared FT-IR spectroscopy. (external link)
• Toft, Jostein; Kvalheim, Olav Martin; Libnau, Fred Olav et al. (1994). Non-linear curvefitting of bilinear data using orthogonal projections for rank analysis. Applications to gas chromatography/ infrared spectrometry and variable temperature infrared studies. (external link)
• Toft, Jostein; Kvalheim, Olav Martin; Libnau, Fred Olav et al. (1994). Non-linear curvefitting of bilinear data using orthogonal projections for rank analysis. Applications to gas chromatography/ infrared spectrometry and variable temperature infrared studies. (external link)
• Hämäläinen, M. D.; Liang, Yi-zeng; Kvalheim, Olav Martin et al. (1993). Deconvolution in one-dimensional chromomatography by heuristic evolving latent projections of whole profiles retention time shifted b y Simplex optimization of cross correlation between target peaks. (external link)
• Liang, Yi-zeng; Kvalheim, Olav Martin (1993). A two-way procedure for background correction of chromatographic/spectroscopic data by means of congruence analysis and least-squares fit of the zero-component regions, comparison with double-centering. (external link)
• Liang, Yi-zeng; Brereton, R. G.; Kvalheim, Olav Martin et al. (1993). Use of chemometrics factor analysis for chromatographic integration: Application to diode-array high-performance liquid chroma tography of mixtures of chlorophyll a degradation products. (external link)
• Alsberg, B. K.; Kvalheim, Olav Martin (1993). Compression of n-order data arrays by B-splines. Part 1. Theory. (external link)
• Christy, A. A.; Liang, Yi-zeng; Hui, C. et al. (1993). Effect of particle size on diffuse reflectance Fourier-transform infrared spectra of polystyrene spheres. (external link)
• Christy, A. A.; Kvalheim, Olav Martin; Libnau, F. O. et al. (1993). Interpretation of chemical structural changes by target-projection analysis of infrared profiles. (external link)
• Christy, A. A.; Nodland, Egil; Kvalheim, Olav Martin (1993). A gas cell for on-line transmission Fourier-transform infrared spectrometry. (external link)
• Toft, J.; Kvalheim, Olav Martin (1993). Resolution parameter for multidetection chromatography. (external link)
• Liang, Yi-zeng; Kvalheim, Olav Martin (1993). Heuristic evolving latent projections: Resolving hyphenated chromatographic profiles by component stripping. (external link)
• Liang, Yi-zeng; Kvalheim, Olav Martin; Höskuldsson, A. (1993). Determination of detection limit and local chemical rank by designing a nonparametric test from the zero-component regions. (external link)
• Liang, Yi-zeng; Kvalheim, Olav Martin (1993). Unique resolution of hidden peaks in multidetection chromatography by first-order differentiation and orthogonal projectio ns. (external link)
• Toft, J.; Kvalheim, Olav Martin (1993). Eigenstructure tracking analysis for demonstration of heteroscedastic noise in instrumental profiles - application to transm ittance and aborbance IR. (external link)
• Liang, Yi-zeng; Kvalheim, Olav Martin; Manne, Rolf (1993). White, grey and black - A classification of methods for quantitative analysis of multicomponent analytical systems. (external link)
• Liang, Yi-zeng; Kvalheim, Olav Martin; Ramani, A. et al. (1993). Resolution of strongly overlapping two-way multicomponent data by means of Heuristic Evolving Latent Projections. (external link)
• Kvalheim, Olav Martin (1992). Laboratory Profile. (external link)
• Kvalheim, Olav Martin; Liang, Yi-zeng (1992). Heuristic Evolving Latent Projection - resolving two-way multicomponent data. Part 1. Selectivity, latent-projective graph, datascope, local rank analysis and unique resolution. (external link)
• Christy, Alfred A.; Liang, Yi-zeng; Kvalheim, Olav Martin (1992). On-line pyrolysis of asphaltenes studied by Diffuse reflectance Fourier transform infrared spectroscopy. (external link)
• Karstang, Terje V.; Toft, Jostein; Kvalheim, Olav Martin (1992). Estimation of prediction error for samples within the calibration range. (external link)
• Toft, Jostein; Kvalheim, Olav Martin; Christy, Alfred A. et al. (1992). Analysis of nontransparent polymers-mixture design, 2nd derivative attenuated total internal reflectance FT-IR and multivariate calibration. (external link)
• Kvalheim, Olav Martin (1992). The latent variable. (external link)
• Brereton, R. G.; Rahmani, A.; Liang, Yi-zeng et al. (1992). Investigation of the allomerization reaction of chlorophylla: use of diode array HPLC, mass spectrometry and chemometrics factor analysis for the detection of early products. (external link)
• Christy, Alfred A.; Kvalheim, Olav Martin (1992). Applications of diffuse reflectance Fourier-transform infrared spectroscopy in petroleum geochemistry. (external link)
• Liang, Yi-zeng; Kvalheim, Olav Martin; Manne, Rolf (1992). White, grey and black - A classification of methods for quantitative and qualitative analysis of multicomponent analytical systems. (external link)
• Liang, Yi-zeng; Kvalheim, Olav Martin; Keller, H. R. et al. (1992). Heuristic Evolving Latent Projection - resolving two-way multicomponent data. Part 2. Detection and resolution of minor component. (external link)
• Christy, Alfred A.; Liang, Yi-zeng; Velapoldi, R. et al. (1992). Effect of particle size on diffuse reflectance infrared spectra of polysterene spheres. (external link)
• Toft, Jostein; Kvalheim, Olav Martin (1992). Eigenstructure tracking analysis for demonstration of heteroscedastic noise in instrumental profiles - application to transmittance and oborbance IR. (external link)
• Hämäläinen, M. D.; Liang, Yi-zeng; Kvalheim, Olav Martin et al. (1992). Deconvolution in one-dimensional chromotography by heuristic evolving latent projections of whole profiles retention time shifted by Simplex optimization of cross correlation between target peaks. (external link)
• Keller, H. R.; Liang, Yi-zeng; Kvalheim, Olav Martin et al. (1992). Evolving factor analysis in the presence of heteroscedastic noise. (external link)
• Alsberg, Bjørn K.; Kvalheim, Olav Martin (1992). Compression of n-order data arrays by B-plines. Part. theory. (external link)
• Liang, Yi-zeng; Kvalheim, Olav Martin; Ramani, A. et al. (1992). Resolution of strongly overlapping two-way multicomponent data by means of Heuristic Evolving Latent Projections. (external link)
• Keller, H. R.; Liang, Yi-zeng; Kvalheim, Olav Martin et al. (1992). A comparison of the Heuristic envolving latent projection and evolving factor analysis methods for peak purity control in HPLCDAD. (external link)
• Liang, Yi-zeng; Manne, Rolf; Kvalheim, Olav Martin (1992). Constrained background bilinearization. (external link)
• Liang, Yi-zeng; Kvalheim, Olav Martin (1992). A two-way procedure for background correction of chromatographic/ spectroscopic data by means of congruence analysis and least-squares fit of the zerocomponent regions, comparison with double-centering. (external link)
• Christy, Alfred A.; Kvalheim, Olav Martin (1992). Applications of diffuse reflectance Fourier transform infrared spectroscopy in petroleum geochemistry. (external link)
• Brereton, R. G.; Rahmani, A.; Liang, Yi-zeng et al. (1992). Investigation of the allomerization reaction of chlorophylla: use of diode array HPLC, mass spectrometry and chemometrics factor analysis for the detection of early products. (external link)
• Christy, A. A.; Kvalheim, Olav Martin (1992). Applications of diffuse reflectance Fourier-transform infrared spectroscopy in petroleum geochemistry. (external link)
• Toft, J.; Kvalheim, Olav Martin; Christy, A. A. et al. (1992). Analysis of non transparent polymers: Mixture design, 2nd derivate attenuated total internal reflectance FT-IR and multivariate calibration. (external link)
• Christy, A. A.; Kvalheim, Olav Martin; Øygard, K. et al. (1991). Maturity of Kerogen and asphaltenes determined by Partial-Least -Squares (PLS) calibration and target projection of diffuse reflectance Fourier-transformed infrared spectra. (external link)
• Karstang, T. V.; Christy, A. A.; Kvalheim, Olav Martin (1991). Diffuse reflectance Fourier-transformed infrared spectroscopy in petroleum exploration: A multivariate approach to maturity determination. (external link)
• Christy, A. A.; Liang, Yi-zeng; Kvalheim, Olav Martin (1991). On-Line pyrolysis of asphaltenes studied by Diffuse reflectance Fourier-transform infrared spectroscopy. (external link)
• Sletten, Einar; Kvalheim, Olav Martin; Kruse, S. et al. (1990). Detection of malignant tumors by multivariate analysis of proton magnetic resonance spectra of serum. (external link)
• Christy, A. A.; Dahl, Birger; Kvalheim, Olav Martin (1989). Structural features of resins, asphaltenes and kerogen studied by diffuse reflectance Fourier-transform infrared spectroscopy. (external link)
• Christy, A. A.; Hopland, A. L.; Barth, Tanja et al. (1989). Quantitative determination of thermal maturity in sedimentary organic matter by diffuse reflectance infrared spectroscopy of asphaltenes. (external link)
• Christy, A. A.; Velapoldi, R. A.; Kvalheim, Olav Martin et al. (1987). Multivariate calibration of diffuse reflectance Fourier-transform infrared spectra of coals as an alternative to rank determination by vitrinite reflectance. (external link)
• Kvalheim, Olav Martin; Christy, A. A.; Bjørseth, A. et al. (1987). Maturity determination of organic matter in coals using the methyl phenanthrene distribution. (external link)
• Telnæs, N.; Bjørseth, A.; Christy, A. A. et al. (1987). Interpretation of multivariate data: Relationship between phenanthrenes in crude oils. (external link)

Academic lecture

• Fanjara, Ernestine; Arneberg, Reidar; Kvalheim, Olav Martin et al. (2025). En kolorimetrisk tilnærming for påvisning av en utvalgt kortisolmetabolitt i avføring som en stressbiomarkør hos atlantisk laks. (external link)
• Kvalheim, Olav Martin; Rajalahti, Tarja (2024). Can chemometrics and metabolomics provide information about a healthy lifestyle?. (external link)
• Kvalheim, Olav Martin; Arneberg, Reidar; Grung, Bjørn et al. (2023). Monitoring and adjusting a batch process using online Raman sensors and multivariate modelling. (external link)
• Vidar, Warren S.; Baumeister, Tim U.H.; Caesar, Lindsay K. et al. (2023). Unlocking New Opportunities for Natural Product Discovery with Interaction Metabolomics. (external link)
• Kvalheim, Olav Martin; Vidar, Warren S.; Baumeister, Tim U.H. et al. (2023). Confounding in model interpretation when using latent variable regression methods to make inferences. (external link)
• Kvalheim, Olav Martin (2021). Characterization of crude oil and crude oil emulsions by NIR spectroscopy and multivariate analysis. (external link)
• Kvalheim, Olav Martin; Rajalahti, Tarja (2021). A novel approach to handle confounders in multicollinear data - applied to study the relation of a measure of insulin resistance (the HOMA score) to lipoprotein subclass patterns in serum from prepubertal children. (external link)
• Kvalheim, Olav Martin (2021). Revealing the information (bioactivity) in multicollinear profiles from natural product extracts. (external link)
• Kvalheim, Olav Martin; Grung, Bjørn; Rajalahti, Tarja (2019). Optimal partial least squares models and predictions of properties using Monte Carlo resampling strategies. (external link)
• Kvalheim, Olav Martin (2019). What is the best measure(s) of variable importance for interpretation and variable selection in multivariate regression models?. (external link)
• Kvalheim, Olav Martin; Grung, Bjørn; Rajalahti, Tarja (2019). Optimal Partial Least Squares models and predictions of properties using Monte Carlo resampling strategies. (external link)
• Kvalheim, Olav Martin; Kellogg, Joshua J.; Caesar, Lindsay K. et al. (2019). Using chromatography and chemometrics for detecting bioactive components in very complex extracts of natural products. (external link)
• Kvalheim, Olav Martin; Arneberg, Reidar; Grung, Bjørn et al. (2018). Development and maintenance of process models - automating the selection and updating of models. (external link)
• Kvalheim, Olav Martin; Rajalahti, Tarja (2018). Bruk av kjemometri til persontilpasset forebygging av livsstilssykdommer. (external link)
• Kvalheim, Olav Martin; Grung, Bjørn (2017). Variable selection in process modeling. (external link)
• Kvalheim, Olav Martin (2017). Selecting the “right” variables in latent variable regression (LVR) modelling in the presence of multicolinearity and orthogonal variation - optimal interpretation and prediction at the same time. (external link)
• Kvalheim, Olav Martin (2017). Revealing the bioactive signature in multicomponent profiles. (external link)
• Kvalheim, Olav Martin; Arneberg, Reidar; Rajalahti, Tarja (2017). Monte Carlo Cross validation for component selection and determination of prediction error in latent-variable regression. (external link)
• Kvalheim, Olav Martin; Arneberg, Reidar; Grung, Bjørn et al. (2017). Determination of optimum number of components in partial least squares regression. (external link)
• Kvalheim, Olav Martin (2016). Analysis of metabolomics data – examples from the study of the lipid metabolism. (external link)
• Kvalheim, Olav Martin (2016). Which factors impact the lipid metabolism and how?. (external link)
• Kellogg, J.; Todd, D. A.; Egan, J. M. et al. (2015). Chemometric-directed bioexploration of natural products. (external link)
• Kvalheim, Olav Martin (2015). Predictive and orthogonal variation in latent variable regression and implications for the concept of model quality and model reduction. (external link)
• Kvalheim, Olav Martin (2014). Variable importance and variable selection in spectral profiles from process analysers. (external link)
• Kvalheim, Olav Martin (2014). Optimal strategies and tools for interpretation and variable selection in spectral profiles from process analysers. (external link)
• Kvalheim, Olav Martin (2014). Optimal strategies and tools for interpretation and variable selection in spectral profiles from process analysers. (external link)
• Kvalheim, Olav Martin (2014). Predictive and orthogonal variation in latent variable regression – model quality and model reduction. (external link)
• Kvalheim, Olav Martin (2014). Model performance, interpretation, prediction performance and SOLV-DPM for process control. (external link)
• Aadland, Eivind; Andersen, John Roger; Kvalheim, Olav Martin et al. (2013). Relationship between physical activity and lipoprotein subclass changes in severely obese women. (external link)
• Rajalahti, Tarja; Arneberg, Reidar; Flikka, Kristian et al. (2007). Preteatment of Mass Spectral Profiles: Application to proteomic data. (external link)
• Kvalheim, Olav Martin; Rajalahti, Tarja; Arneberg, Reidar et al. (2007). Analysis of Proteomic Profiles. (external link)
• Kvalheim, Olav Martin (2007). Analysis of Proteomic Profiles: Pretreatment and Biomarker Discovery for early diagnosis of diseases. (external link)
• Kvalheim, Olav Martin; Rajalahti, Tarja; Arneberg, Reidar et al. (2007). Target projection and proper data pre-treatment for the analysis of proteomic profiles. (external link)
• Kvalheim, Olav Martin (2007). Analysis of Proteomic Profiles - Biomarker Discovery and Early Diagnosis. (external link)
• Kvalheim, Olav Martin (2003). Introduction to design, Design of Experiments. (external link)
• Kvalheim, Olav Martin (2003). Medical application of GC- and LC- MS and MS resolver. (external link)
• Kvalheim, Olav Martin (2003). Resolution of GC-MS and LC-MS profiles of very complex biomedical samples. (external link)
• Kvalheim, Olav Martin (2003). Introduction of NOx-handling (pre & post, existing context, R&D, where are we today?) Handling of NOx in exhaust gases. (external link)
• Kvalheim, Olav Martin (2001). Identification of and solution to the problem of lurking variables in industrial processes. (external link)
• Kvalheim, Olav Martin (1997). PVA and related methods applied to improvement of industrial processes and product quality. (external link)
• Kvalheim, Olav Martin (1997). Kjemometri og kvalitet processes and product quality. (external link)
• Kvalheim, Olav Martin (1997). Chemometrics - advanced methods. (external link)
• Kvalheim, Olav Martin (1997). Detection and resolution of overlapping peaks in multidetection chromatography. (external link)
• Kvalheim, Olav Martin (1997). Environmental monitoring and forecasting by means of multivariate methods. (external link)
• Kvalheim, Olav Martin (1997). 2-D multicomponent analysis by means of Extricator. (external link)
• Kvalheim, Olav Martin (1997). En innføring i multikomponentanalyse. (external link)
• Kvalheim, Olav Martin (1997). Multivariate information extraction as a strategic and communication tool in the industrial enterprise. (external link)
• Høiland, Harald; Førland, Geir Martin; Kvalheim, Olav Martin et al. (1997). The associative behaviour of benzyl alcohol in carbon tetrachloride solutions. (external link)
• Christy, A. A.; Kvalheim, Olav Martin (1993). Particle size problem in diffuse reflectance spectrometry. (external link)
• Libnau, O.; Christy, A. A.; Aksnes, G. et al. (1993). Temperature dependency of the infrared spectra of water studied by Fourier-transform infrared spectroscopy. (external link)
• Christy, A. A.; Kvalheim, Olav Martin (1993). Particle size problem in diffuse reflectance Fourier-transform infrared spectrometry. Plenary lecture. (external link)
• Christy, Alfred A.; Liang, Yi-zeng; Kvalheim, Olav Martin (1992). Determination of activation energy for the thermal decomposition of kerogen by on-line pyrolysis infrared spectroscopy. (external link)
• Christy, Alfred A.; Kvalheim, Olav Martin (1992). Applications of chemometrics in infrared microspectroscopy. (external link)
• Christy, Alfred A.; Kvalheim, Olav Martin (1992). Multivariate analysis of infrared spectroscopic data: Application to the chemical transformation of sedimentary organic matter. (external link)

Popular scientific article

• Kvalheim, Olav Martin (2024). En strategi for å finne synergier mellom kjemiske forbindelser i biologisk aktive blandinger. (external link)
• Kvalheim, Olav Martin; Rajalahti, Tarja (2024). Interaksjon mellom marine omega-3 fettsyrer og fysisk aktivitet forebygger hjerte/kar-uhelse. (external link)
• Kvalheim, Olav Martin; Arneberg, Reidar; Buarø, Marita et al. (2023). Konsentrasjon- og temperatur optimalisering av destillasjonsprosesser ved hjelp av optiske sensorer og flervariabel modellering. (external link)
• Kvalheim, Olav Martin (1997). Ny prosessutvikling. (external link)
• Kvalheim, Olav Martin (1997). Chemometrics at the University of Bergen. (external link)
• Kvalheim, Olav Martin (1996). Kan kjemometrien hjelpe Norge til å bli "Europas Japan"?. (external link)
• Kvalheim, Olav Martin (1996). Kjemometri - en metodikk for generering og analyse av data. (external link)
• Kvalheim, Olav Martin (1992). Universitets-industri samarbeid - går det an?. (external link)
• Kvalheim, Olav Martin (1992). Kjemometri og kvalimetri - Pilotprosjekt i COMETT-regi. (external link)

Feature article

• Kvalheim, Olav Martin; Noren, Bjørn (2023). Nasjonal strategi for tidlig diagnose av prostatakreft. (external link)
• Kvalheim, Olav Martin (1996). Chemometrics, quality, information and "The Third Wawe". (external link)
• Kvalheim, Olav Martin (1994). Kjemometri - En strategi for total optimalisering av produktkvalitet og industrielle prosesser. (external link)
• Kvalheim, Olav Martin (1993). Chemometrics: academic and industrial perspectives. (Editorial). (external link)

Reader opinion piece

• Kvalheim, Olav Martin (2021). Politikerbestemt strømkrise kommer ikke til å gå over. (external link)
• Kvalheim, Olav Martin; Hannesson, Røgnvaldur (2020). Fremdeles ingen kunder til CO2-fangst og lagring. (external link)
• Kvalheim, Olav Martin; Hannesson, Røgnvaldur (2020). Hvor er kundene for CO2-fangst og hydrogen?. (external link)
• Kvalheim, Olav Martin (2020). «Koronaviruset gjør ting klimaaktivistene lenge har ønsket seg». (external link)
• Kvalheim, Olav Martin (2015). Et miljøvennlig og samfunnsnyttig prosjekt. (external link)
• Kvalheim, Olav Martin (2015). Folkeavstemningen om Engebø. (external link)
• Kvalheim, Olav Martin (2015). Kan ikkje vere kjøpt og betalt. (external link)
• Kvalheim, Olav Martin (2007). CO2-lobbyen styrer forskningen. (external link)
• Kvalheim, Olav Martin (2007). Proppfull av CO2 ?. (external link)

Lecture

• Kvalheim, Olav Martin (2019). Multivariate pattern analysis - why and how to do it?. (external link)
• Kvalheim, Olav Martin (2019). Kan vi stole på resultater fra «liten N»?. (external link)
• Kvalheim, Olav Martin; Rajalahti, Tarja (2018). Fjordomics - Persontilpasset forebygging (folkehelse) og behandling vha utvidede blodanalyser. (external link)
• Rajalahti, Tarja; Kvalheim, Olav Martin (2017). What can we use the new NMR platform for?. (external link)
• Kvalheim, Olav Martin (2017). Latent variables - How to find the information in multivariate data. (external link)
• Kvalheim, Olav Martin (2016). Eksempler på data-analyse i metabolomikk-prosjekter med fokus på lipidmetabolismen. (external link)
• Kvalheim, Olav Martin (2016). Analytisk strategier for persontilpasset medisin og helseovervåkning. (external link)
• Kvalheim, Olav Martin (2016). Hvilke faktorer påvirker lipidmetabolismen og hvordan kan vi bruke kunnskapen om dette?. (external link)
• Kvalheim, Olav Martin (2015). Frisk med fisk - men hvilken?. (external link)
• Kvalheim, Olav Martin (2015). Frisk med fisk - nye bevis. (external link)
• Kvalheim, Olav Martin (1997). Multivariate analysis of chemical data. (external link)
• Kvalheim, Olav Martin (1997). Multivariate metoder i prosessutvikling (10 dager). (external link)
• Kvalheim, Olav Martin (1997). Chemometrics in Bergen. (external link)
• Kvalheim, Olav Martin (1996). The third wave: Convergence of chemometrics, information and quality into an inductive approach for complex real-world problems. (external link)
• Kvalheim, Olav Martin (1996). Analysis of evolving systems - applications to multicomponent profiles from diode array detection and infrared analysis. (external link)
• Kvalheim, Olav Martin (1996). The third wave: Convergence of chemometrics, information and quality into an inductive approach for complex real-world problems. (external link)
• Kvalheim, Olav Martin (1996). Multicomponent analysis of dynamic systems. (external link)
• Kvalheim, Olav Martin (1996). Analysis of evolving systems - applications to multicomponent profiles from diode array detection and infrared analysis. (external link)
• Christy, A. A.; Skogheim, O. Å.; Libnau, F. O. et al. (1995). Resolution of infrared spectra of unstable species in liquid solutions. (external link)
• Christy, A. A.; Kvalheim, Olav Martin (1994). Considerations for quantitative analysis in reflectance spectroscopy Plenary lecture. (external link)
• Christy, A. A.; Kvalheim, Olav Martin; Velapoldi, R. A. (1994). Modification of Kubelka Munk function for quantitative analysis in diffuse reflectance spectrometry. (external link)
• Libnau, F. O.; Christy, A. A.; Kvalheim, Olav Martin (1994). Kinetic analysis of Mutarotation of _a-Glucose in water. (external link)
• Christy, A. A.; Kvalheim, Olav Martin; Velapoldi, R. A. (1994). Quantitative analysis in diffuse reflectance spectrometry: Modification of Kubelka-Munk equation. (external link)
• Christy, A. A.; Kvalheim, Olav Martin (1993). Structural differences in asphaltenes analysed by target projection analysis SSC3. (external link)
• Christy, A. A.; Kvalheim, Olav Martin (1993). Structure and dehydration of calcium oxalate monohydrate. (external link)
• Christy, A. A.; Nordland, E.; Burnham, A. et al. (1993). Determination of kinetic parameters for the dehydration of calcium oxalate monohydrate by On-Line pyrolysis diffuse reflectance infrared spectrometry. (external link)
• Christy, A. A.; Liang, Yi-zeng; Kvalheim, Olav Martin (1992). Determination of activation energy for the thermal decomposition of kerogen by online pyrolysis infrared spectroscopy. (external link)
• Christy, A. A.; Kvalheim, Olav Martin (1992). Applications of chemometrics in infrared microspectrometry (invited plenary lecture). (external link)
• Christy, A. A.; Kvalheim, Olav Martin; Dahl, Birger (1992). Determination of the kinetic parameters for the decomposition of kerogen samples using On-Line pyrolysis diffuse reflectance Fourier-transform infrared spectrometry. (external link)
• Christy, A. A.; Kvalheim, Olav Martin (1992). Multivariate analysis of infrared spectroscopic data: Application to the chemical transformation of sedimentary organic matter (invited plenary lecture). (external link)
• Christy, A. A.; Kvalheim, Olav Martin; Dahl, Birger et al. (1990). Identification of maturity factors by Partial-Least-Square target rotation of diffuse reflectance infrared spectroscopic profiles aquired on extracts of coals and sediments. (external link)
• Christy, A. A.; Kvalheim, Olav Martin; Karstang, T. V. (1990). Interpretation of diffuse reflectance infrared spectroscopic profiles obtained by multivariate target projection. (external link)
• Christy, A. A.; Kvalheim, Olav Martin; Karstang, T. V. (1990). Multivariate calibration in petroleum geochemistry. (external link)
• Christy, A. A.; Kvalheim, Olav Martin; Dahl, Birger (1989). Structural features of resins, asphaltenes and kerogens studied by diffuse reflectance infrared spectroscopy. (external link)
• Karstang, T. V.; Christy, A. A.; Kvalheim, Olav Martin (1989). Diffuse reflectance Fourier-transform infrared spectroscopy and multivariate data analysis in petroleum exploration: New parameters for basin modelling. (external link)
• Christy, A. A.; Kvalheim, Olav Martin; Karstang, T. V. et al. (1986). Multivariate analysis of diffuse reflectance spectra of coals. (external link)

Abstract

• Aadland, Eivind; Kvalheim, Olav Martin; Anderssen, Sigmund Alfred et al. (2018). The multivariate physical activity signature associated with metabolic health in children. (external link)
• Aadland, Eivind; Andersen, Lars Bo; Anderssen, Sigmund Alfred et al. (2018). Associations for volumes and patterns of physical activity with metabolic health in children: a multivariate pattern analysis approach. (external link)
• Jones, Paul Remy; Kvalheim, Olav Martin; Resaland, Geir Kåre et al. (2018). Lipoprotein subclasses and their associations with physical activity and sedentary time in Norwegian schoolchildren: The Active Smarter Kids study. (external link)
• Resaland, Geir Kåre; Rajalahti, Tarja; Aadland, Eivind et al. (2017). Strong association between cardiorespiratory fitness and serum lipoprotein subclass pattern in prepubertal healthy children. (external link)
• Britton, Emily R.; Kellogg, Joshua J.; Kvalheim, Olav Martin et al. (2016). New strategies to identify synergists from Hydrastis canadensis (goldenseal). (external link)
• Kellogg, Joshua J.; Kvalheim, Olav Martin; Cech, Nadja B. (2016). Biochemometric analysis reveals complimentary bacterial inhibitory functionalities of the medicinal lichen Usnea barbata. (external link)
• Rajalahti, Tarja; Aadland, Eivind; Andersen, John Roger et al. (2014). A multivariate approach to reveal biomarker signatures in instrumental profiles of body fluids. (external link)
• Lin, Chenchen; Mjøs, Svein Are; Våge, Villy et al. (2014). Effect of two types of bariatric surgery on the fatty acid profile in serum. (external link)
• Jepsen, Randi; Andersen, John Roger; Aadland, Eivind et al. (2011). Health Related Quality of Life in in-patients undergoing lifestyle treatment for morbid obesity. (external link)
• Rajalahti, Tarja; Arneberg, Reidar; Berven, Frode et al. (2008). Biomarker discovery from mass spectral profiles: A combined proteomics and multivariate analysis. (external link)
• Kvalheim, Olav Martin; Arneberg, Reidar; Marquardt, Brian (2008). PAT - Optimal prediction of properties by means of tailormade modelling of spectroscopic/chromatographic profiles. (external link)
• Rajalahti, Tarja; Arneberg, Reidar; Berven, Frode et al. (2008). Early diagnosis and biomarker discovery from mass spectral profiles: application to multiple sclerosis. (external link)

Interview

• Valle, Marius; Kvalheim, Olav Martin; Underhaug, Jarl (2017). NMR-spektroskopi - Disse maskinene har potensial til å revolusjonere helsen din. (external link)
• Kvalheim, Olav Martin; Rajalahti, Tarja; Skjerdal, Sigrid et al. (2017). Har fått 13 millionar til nytt forskningsprosjekt. (external link)
• Kvalheim, Olav Martin; Rajalahti, Tarja; Bolstad, Jon et al. (2017). Forskning i tetskjiktet. (external link)
• Kvalheim, Olav Martin; Rajalahti, Tarja; Bolstad, Jon et al. (2017). Vestlandsblod under lupen. (external link)
• Kvalheim, Olav Martin; Hjetland, Geir Bjarte (2016). Det beste er jo å ikkje få kreft. (external link)
• Kvalheim, Olav Martin; Heggen, Håvard (2016). Trening og mat har større effekt for overvektige. (external link)
• Grimelid, Frode; Kvalheim, Olav Martin (2015). Heller betre laks enn meir laks. (external link)
• Grimelid, Frode; Kvalheim, Olav Martin; Nerdal, Willy (2015). Meir og meir usunt omega-3 i laksen. (external link)
• Kvalheim, Olav Martin; Nerdal, Willy (2015). Jo, økt innhold av plante-omega-3 gjør oppdrettslaksen mindre sunn enn tidligere. (external link)
• Grimelid, Frode; Kvalheim, Olav Martin; Nerdal, Willy (2015). Meir usunt omega-3 i laksen. (external link)
• Tollaksen, Tor Gunnar; Kvalheim, Olav Martin (2015). Folk føres bak klimalyset. (external link)
• Johnsen, Helge; Kvalheim, Olav Martin; Rajalahti, Tarja (2015). Knekkjer trankoden. (external link)
• Nerdal, Willy; Kvalheim, Olav Martin; Hauge, Arne (2015). Fikk feit idé i Mikkeli. (external link)

Doctoral dissertation

• Lin, Chenchen; Kvalheim, Olav Martin (2016). Multivariate analysis of human serum fatty acid profiles. (external link)
• Deng, Baichuan; Kvalheim, Olav Martin (2015). Multivariate analysis and model population analysis in chemical modeling. (external link)
• Kvalheim, Olav Martin (1987). Methods for the interpretation of multivariate data : examples from petroleum geochemistry. (external link)

Poster

• Kvalheim, Olav Martin; Våge, Villy; Andersen, John Roger et al. (2016). Impact of bariatric surgery and intensive lifestyle intervention on serum omega-3 profiles. (external link)
• Kellogg, J.; Todd, D. A.; Egan, J. M. et al. (2015). Chemometric-directed bioexploration of natural products. (external link)
• Lin, Chenchen; Rajalahti, Tarja; Mjøs, Svein Are et al. (2015). Cardiovascular health revealed as correlation patterns and predictive relationships between serum lipoprotein and fatty acid features in non-obese Norwegian adults. (external link)
• Jepsen, Randi; Andersen, John Roger; Aadland, Eivind et al. (2011). Health Related Quality of Life in in-patients undergoing lifestyle treatment for morbid obesity. (external link)
• Stordrange, Laila; Libnau, Fred Olav; Malthe-Sørensen, Dick et al. (2001). Performance of multivariate calibration methods for determination of the active ingredient and impurity in a pharmaceutical process solution analysed by near infrared spectroscopy. (external link)
• Christy, A. A.; Kvalheim, Olav Martin (1994). Resolving OH stretching vibrations of the water of crystallization of calcium oxalate monohydrate by evolutionary factor analysis of infrared spectroscopic profiles. (external link)
• Christy, A. A.; Kvalheim, Olav Martin (1990). Structural changes during on-line pyrolysis of kerogen and asphaltenes as monitored by using diffuse reflectance infrared spectroscopy. (external link)
• Christy, A. A.; Kvalheim, Olav Martin; Karstang, T. V. (1988). Multivariate calibration of diffuse reflectance spectra of asphaltenes for thermal maturity. (external link)
• Christy, A. A.; Kvalheim, Olav Martin; Velapoldi, R. A. (1988). The determination of geologic maturation process using diffuse reflectance infrared Fourier-transform spectroscopy. (external link)
• Christy, A. A.; Kvalheim, Olav Martin; Telnæs, N. (1987). Applications of diffuse reflectance infrared spectroscopy to petroleum geochemistry: Thermal maturity. (Received first prize as the best poster presentation). (external link)

Editorial

• Ala-Korpela, Mika; Salomaa, Veikko; Kvalheim, Olav Martin (2011). Clinical and Epidemiological Metabonomics. (external link)
• Kvalheim, Olav Martin; Grung, Bjørn; Nodland, Egil et al. (2010). The 11th Scandinavian Symposium on Chemometrics, Loen, Norway, 8-11 June 2009. (external link)

Academic literature review

• Rajalahti, Tarja; Kvalheim, Olav Martin (2011). Multivariate data analysis in pharmaceutics: A tutorial review. (external link)

Book review

• Kvalheim, Olav Martin (2007). Media med dommedagsprofetier om klimaet. (external link)

Encyclopedia article

• Kvalheim, Olav Martin (2002). Introduction to factor-based approaches. (external link)

Report

• Kvalheim, Olav Martin; Ugland, K.I. (1997). Virkninger av kjemikalieutslipp fra petroleumsvirksomhet i Skagerak. Konsekvensutredning for OED. (external link)
• Libnau, F. O.; Christy, A. A.; Kvalheim, Olav Martin (1995). Grunn-hydrofilisering av QX-6, Prins-reaksjon. (external link)
• Christy, A. A.; Kvalheim, Olav Martin (1994). Determination of kinetic parameters of kerogen samples by on-line diffuse reflectance FT-IR spectroscopy. (external link)
• Christy, A. A.; Kvalheim, Olav Martin (1990). Comparison of infrared spectra of petroleum fractions oil fractions. (external link)
• Christy, A. A.; Kvalheim, Olav Martin (1989). Characterization of crude oils by multivariate data analysis of diffuse reflectance infrared spectra of asphaltenes. (external link)
• Christy, A. A.; Kvalheim, Olav Martin (1987). Multivariate calibration of diffuse reflectance spectra of coke samples against volatile organic matter. (external link)

Academic chapter/article/Conference paper

• Libnau, Fred Olav; Christy, Alfred Antony; Kvalheim, Olav Martin (1996). Infrarød spektroskopi og kjemisk analyse. (external link)
• Kvalheim, Olav Martin (1996). Kvalitet, organisasjon og psykososialt arbeidsmiljø. (external link)
• Brekke, Trond; Kvalheim, Olav Martin (1996). Analysis of nuclear magnetic resonance spectra of mixtures using multivariate techniques. (external link)
• Kvalheim, Olav Martin (1996). Taksonomi og kvantifisering av blandinger. (external link)
• Kvalheim, Olav Martin; Brakstad, F. (1996). Kartlegging av komplekse industriprosesser for total prosesskvalitet. (external link)
• Libnau, Fred Olav; Christy, A.A.; Kvalheim, Olav Martin (1996). Surface layer and multilayer laminate analysis by chemometrics and and infrared spectroscopy. (external link)
• Kvalheim, Olav Martin (1996). Fra data til informasjon. (external link)
• Christy, A. A.; Kvalheim, Olav Martin (1995). Analytical profiles and Multivariate modelling in Geochemistry. (external link)
• Christy, A. A.; Kvalheim, Olav Martin (1993). Analytical profiles and Multivariate modelling in Geochemistry. (external link)
• Kvalheim, Olav Martin; Karstang, Terje V. (1992). SIMCA - classification by means of cross validated disjoint principal component models. (external link)
• Kruse, S.; Kvalheim, Olav Martin; Farstad, Marit et al. (1992). Effect of sample storage on spectra of serum - multivariate data analysis of protein NMR spectra. (external link)

See a complete overview of publications in Cristin.