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Andries van der Ark is a Professor at the University of Amsterdam, specializing in Psychometrics within the Faculty of Social and Behavioural Sciences. His research interests focus on statistical analysis of test data, which he divides into four main themes: finding statistical solutions to practical data problems such as handling missing data and outliers, applications of psychological tests, development of nonparametric item response theory models including Mokken scale analysis, and development of categorical marginal models for test data application. He has contributed methodologically and statistically to substantive papers in social and behavioural sciences and has experience in software development with R. Additionally, he is involved in various scholarly societies including the Psychometric Society and the International Test Commission, holding editorial positions in several academic journals.
Includes departments like Economics, Business Administration, Finance, and Marketing.