Andries van der Ark is Assistant Professor in the Department of Methodology and Statistics at Tilburg University in The Netherlands. He specializes in item response theory, latent class models, and missing data analysis. Marcel A. Croon is Associate Professor in the Department of Methodology and Statistics at Tilburg University. His research focuses on the study of structural models for categorical and continuous variables. Klaas Sijtsma is Professor and Chair of the Department of Methodology and Statistics at Tilburg University. He is a member of the editorial board of ""Applied Psychol...