PD Dr. Kristian Kleinke
Psychologist and licensed psychotherapist · Senior lecturer for psychological methods, University of Siegen
I teach the statistics courses in our psychology programmes and do methodological research on missing data and multiple imputation with a focus on how to impute data that refuse to be normal: count variables, skewed distributions, clustered and panel structures, and samples too small for the textbook answer.
My applied work is deliberately broad. It spans criminology, clinical psychology, ageing research and health psychology, usually as the person who makes the data analysable.
Books and software
Textbook · De Gruyter, 2017
Strukturgleichungsmodelle mit Mplus
A hands-on introduction to structural equation modelling, with commented Mplus syntax for published empirical work.
Monograph · Springer, 2020
Applied Multiple Imputation
Theory and practice of multiple imputation, including recent methods for data that violate the usual distributional assumptions.
countimp
R package · v3
Software · Version 3 · GPL-3
countimp
Multiple imputation of incomplete count data. Thirteen count families — including truncation, censoring, known bounds and underdispersion, which almost no other package offers.
Recent publications
Formatting follows APA 7.
2026
Florack, J., Athanasiadi, E., Theile-Schürholz, A., Müller, T., Oswald, F., Kleinke, K., & Haberstroh, J. (2026). Is the home a better place for people with dementia to make decisions? GeroPsych. https://doi.org/10.1024/1662-9647/a000359
Kessler, E.-M., Kleinke, K., Engel, J. V., & Forstmeier, S. (2026). Age-sensitive telehealth group therapy for depression in older adults with and without comorbid anxiety (VISION-AGE): Study protocol for a randomized controlled trial in an embedded mixed-methods design. BMC Psychiatry, 26, 215.
Kleinke, K., & Gaisbauer, H. (2026). From Probabilistic to Deterministic Missingness: When Predictive Mean Matching Breaks Down Under MAR [Preprint]. PsyArXiv. https://doi.org/10.31234/osf.io/db7tz_v1
Machulska, A., Kleinke, K., Neubert, M., Sünkel, E., Bück, J., & Klucken, T. (2026). Long-term outcomes of approach-bias-modification for smoking cessation: A six-month and four-year follow-up study. Behaviour Research and Therapy, 105090. https://doi.org/10.1016/j.brat.2026.105090
2025
Athanasiadi, E., Thyrian, J. R., Florack, J., Theile-Schürholz, A., Karneboge, J., Müller, T., Kleinke, K., et al. (2025). Project DECIDE II: Evaluating the efficacy of supported advance care decision making within routine care in dementia: A randomized controlled trial. BMC Medical Ethics, 26(1), 124. https://doi.org/10.1186/s12910-025-01290-6