Contact Information
725 S. Wright St.
M/C 374
Champaign, IL 61820
Biography
Assistant Professor and Associate Professor, Biostatistics and Medical Informatics, University of Wisconsin-Madison (1995-2001)
Research Interests
- Psychometrics
- Latent Variable Models
- Multivariate Categorical Data Analysis
Research Description
Assistant Professor and Associate Professor, Biostatistics and Medical Informatics, University of Wisconsin-Madison (1995-2001)
- Associate Editor, Statistics and Its Interface (2007-)
- Associate Editor, Psychometrika (2003-)
- Co-director of Educational and Psychological Measurement Lab
Education
- PhD, Statistics, University of Illinois at Urbana-Champaign, 1995
- BS, Mathematics, University of Illinois at Urbana-Champaign, 1990
Awards and Honors
- Associate Editor, Statistics and Its Interface (2007-)
- Associate Editor, Psychometrika (2003-)
- Co-director of Educational and Psychological Measurement Lab
Additional Campus Affiliations
Professor, Statistics
Professor, Psychology
Professor, Educational Psychology
External Links
Recent Publications
Le, T., Culpepper, S., & Douglas, J. (2026). Longitudinal Designs for Diagnostic Models: Identification and Estimation. Psychometrika. Advance online publication. https://doi.org/10.1017/psy.2026.10128
Wayman, E. A., Culpepper, S. A., Douglas, J., & Bowers, J. (2026). A Restricted Latent Class Hidden Markov Model for Polytomous Responses, Polytomous Attributes, and Covariates: Identifiability and Application. Journal of Educational and Behavioral Statistics. Advance online publication. https://doi.org/10.3102/10769986251415569
Wayman, E. A., Culpepper, S. A., Douglas, J., & Bowers, J. (2026). A restricted latent class model with polytomous attributes and respondent-level covariates. Behaviormetrika, 53(2), 833-861. https://doi.org/10.1007/s41237-025-00271-8
He, S., Culpepper, S. A., & Douglas, J. A. (2025). A sparse latent class model incorporating response times. British Journal of Mathematical and Statistical Psychology, 78(3), 757-784. https://doi.org/10.1111/bmsp.12380
He, S., Culpepper, S. A., & Douglas, J. (2023). A Sparse Latent Class Model for Polytomous Attributes in Cognitive Diagnostic Assessments. In L. Andries van der Ark, W. H. M. Emons, & R. R. Meijer (Eds.), Essays on Contemporary Psychometrics (pp. 413-442). (Methodology of Educational Measurement and Assessment). Springer. https://doi.org/10.1007/978-3-031-10370-4_21