Talks

🎤 Invited Talks and Presentations

1. Irmer, J. P. (2026, March 26). From nonparametric model selection to model-implied simulation-based power estimation: Towards an adaptive, machine-learning inspired framework for complex structural equation models and beyond [Invited talk]. Society & Choice Research Seminars, University of Basel, Switzerland.
1. Irmer, J. P. (2025, September). Model selection and the estimation of statistical power for nonlinear structural equation modeling [Award keynote]. 17th Conference of the Methods & Evaluation Section of the German Psychological Society (DGPs), Berlin, Germany.
1. Irmer, J. P. (2025, June 25). From nonparametric model selection to model-implied simulation-based power estimation: A machine-learning-inspired, adaptive simulation framework for complex structural equation models and beyond [Invited talk]. Dynamic Modeling Lab Meeting, Utrecht University, Netherlands.
1. Irmer, J. P. (2025, June 10). From model selection to a novel simulation-based power estimation method: Applications to nonlinear SEM [Invited talk]. Kolloquium Psychologische Methodenlehre, Philipps University Marburg, Germany.
1. Irmer, J. P. (2025, May 14). Model selection and the estimation of statistical power in nonlinear structural equation modeling [Invited presentation]. Presentation before the committee of the Preis der Vereinigung der Freunde und Förderer der Johann Wolfgang Goethe-Universität e.V., Frankfurt, Germany.
1. Irmer, J. P. (2025, January). Overcoming the challenges of nonlinear SEM: A novel simulation-based power estimation method [Invited talk]. Department Colloquium, University of Kassel, Germany.
1. Irmer, J. P., & Grønneberg, S. (2023, September). Motivation and diagnostics for nonlinear structural equation models using non-parametric regression among factor scores [Invited talk]. Research Seminar in Data Science, Norwegian Business School, Oslo, Norway.
1. Irmer, J. P. (2023, April). On problems and their solutions in nonlinear structural equation modeling [Invited talk]. Research Colloquium, Department of Psychological Methods, Philipps University Marburg, Germany.
1. Irmer, J. P. (2022, October). PandaR as an example for open teaching practices [Invited talk]. ReproducibiliTea Frankfurt, Goethe-University Frankfurt, Germany. 🌐 Slides/OSF
1. Irmer, J. P. (2021, June). Nichtlineare Strukturgleichungsmodelle [Nonlinear structural equation modeling] [Invited talk]. Research Colloquium, Department of Psychological Methods, Humboldt-Universität zu Berlin, Germany.

🗣️ Discussions and Organized Symposia

1. Frick, S., Irmer, J. P., Meiser, T., Strobl, C., Siepe, B., & Ulitzsch, E. (2025, September). Quality standards for simulation studies [Panel discussion]. 17th Conference of the Methods & Evaluation Section of the German Psychological Society (DGPs), Berlin, Germany.
1. Gärtner, A., Badstuber, N., Schwake, M., Baierer, F., Irmer, J. P., Henninger, M., Pfeuffer, C., & Ortner, T. (2024, September). Gibt es einen Nachwuchsmangel in der Psychologie? Eine kritische Analyse [Panel discussion]. 53rd Congress of the German Psychological Society (DGPS), Vienna, Austria.
1. Brandt, H., Hecht, M., Sengewald, M., Frick, S., & Irmer, J. P. (2024, September). The use of machine learning for psychological research: What are its opportunities to answer substantive research questions? [Organized symposium]. 53rd Congress of the German Psychological Society (DGPS), Vienna, Austria.

📊 Conference Presentations

1. Nehler, K. J., Irmer, J. P., & Schultze, M. (2026, July). Why ordinal data can create spurious edges in psychological networks [Conference presentation]. International Meeting of the Psychometric Society 2026 (IMPS 2026), Seoul, Republic of Korea.
1. Irmer, J. P., & Voelkle, M. C. (2025, September). No analytical power formula? No problem. A general model-implied simulation-based approach to power estimation for likelihood ratio tests with applications in complex SEM [Conference presentation]. 17th Conference of the Methods & Evaluation Section of the German Psychological Society (DGPs), Berlin, Germany.
1. Irmer, J. P. (2025, March). Model selection, diagnostics, and motivation for nonlinear structural equation models via non-parametric regression among factor scores [Conference presentation]. DagStat 2025 – Joint Statistical Meeting of the DAGStat, Berlin, Germany.
1. Irmer, J. P. (2025, March). Power up your nonlinear SEM analysis: Model-implied simulation-based power estimation with powerNLSEM using asymptotic normality [Conference presentation]. Meeting of the Working Group Structural Equation Modeling, Chemnitz, Germany.
1. Irmer, J. P. (2024, September). Estimating power in moderated mediation models: A model-implied simulation-based power estimation approach introducing the powerNLSEM R-package [Conference presentation]. 53rd Congress of the German Psychological Society (DGPS), Vienna, Austria.
1. Hartig, J., Köhler, C., & Irmer, J. P. (2024, September). Sollte bei der Beurteilung des Itemfit anhand von Infit und Outfit auf die Verwendung pauschaler Cut-Off-Werte verzichtet werden? [Conference presentation]. 53rd Congress of the German Psychological Society (DGPS), Vienna, Austria.
1. Schultze, M., Irmer, J. P., & Nehler, K. J. (2023, September). pandaR [Conference presentation]. CIHH23 Campus Innovation, Hamburg, Germany.
1. Irmer, J. P., Klein, A. G., & Schermelleh-Engel, K. (2023, September). Simulation-based semi-parametric estimation of power in nonlinear SEM [Conference presentation]. 15th Meeting of the DGPS Methods & Evaluation Division (FGME), Konstanz, Germany.
1. Grønneberg, S., & Irmer, J. P. (2023, September). Non-parametric regression among factor scores [Conference presentation]. Conference for Frontier Research in Educational Measurement (FREMO), Oslo, Norway.
1. Kern, M., Irmer, J. P., Dormann, C., & Zapf, D. (2023, September). Analyse komplexer Längsschnittdaten mit zeitkontinuierlichen Strukturgleichungsmodellen am Beispiel von sozialen Stressoren und Gesundheit [Analysis of complex longitudinal data using CTSEM] [Conference presentation]. 13th Meeting of the DGPS Work, Organizational, and Business Psychology Division, Kassel, Germany.
1. Irmer, J. P., Klein, A. G., & Schermelleh-Engel, K. (2023, March). Estimating power in moderated mediation models and endogenous moderation model: The powerNLSEM R-package [Conference presentation]. Meeting of the Working Group Structural Equation Modeling 2023 (ATLAS Conference), Bielefeld, Germany.
1. Irmer, J. P., Klein, A. G., & Schermelleh-Engel, K. (2022, October). Challenges faced in simulation studies examining nonlinear SEM with distributional misspecification [Conference presentation]. 2nd Methods Retreat for Young Researchers, Kassel, Germany.
1. Irmer, J. P., Klein, A. G., & Schermelleh-Engel, K. (2022, September). Treating ordered-categorical data as continuous in nonlinear SEM: The crucial role of the dependent variable’s distribution [Conference presentation]. 52nd Congress of the German Psychological Society (DGPS), Hildesheim, Germany.
1. Klein, A. G., & Irmer, J. P. (2022, September). Causal interpretation of statistical models: Can scientific philosophers give directions for statistical modeling? [Conference presentation]. 52nd Congress of the German Psychological Society (DGPS), Hildesheim, Germany.
1. Irmer, J. P., Büchner, R. B., & Klein, A. G. (2021, March). A quasi-likelihood ratio test to evaluate heterogeneous growth [Conference presentation]. 1st Methods Retreat for Young Researchers, Aachen (Online), Germany.
1. Irmer, J. P., Klein, A. G., Gäde, J. C., & Schermelleh-Engel, K. (2021, March). Robustness of LMS compared to regression methods when categorical data are treated as continuous [Conference presentation]. Meeting of the Working Group Structural Equation Modeling 2021, Vienna (Online), Austria.
1. Irmer, J. P., Büchner, R. B., Schneider, G., & Klein, A. G. (2019, September). A quasi-likelihood ratio test to evaluate nonlinear SEM using quasi maximum likelihood [Conference presentation]. 14th DGPS Methods & Evaluation Division Meeting, Kiel, Germany.
1. Holman, D., Escaffi-Schwarz, M., Vasquez, C. A., Irmer, J. P., & Zapf, D. (2019, June). A meta-analytic test of the core mediational proposition of job crafting theory [Conference presentation]. EAWOP Small Group Meeting “Antecedents of Work Design”, Amsterdam, The Netherlands.
1. Irmer, J. P., Büchner, R. D., & Klein, A. G. (2019, February–March). Global model fit test for nonlinear SEM using quasi maximum likelihood [Conference presentation]. Meeting of the Working Group Structural Equation Modeling 2019, Tübingen, Germany.
1. Irmer, J. P., Büchner, R. D., & Klein, A. G. (2018, September). Zur Robustheit des Quasi-Likelihood-Quotienten-Tests für nichtlineare Strukturgleichungsmodelle [On the robustness of quasi-likelihood ratio tests for nonlinear SEM] [Conference presentation]. 51st DGPS Congress, Frankfurt am Main, Germany.
1. Büchner, R. D., Klein, A. G., & Irmer, J. P. (2018, September). Quasi-likelihood ratio test zur Beurteilung der Gesamtmodellgüte von nichtlinearen SEM [A quasi-likelihood ratio test for the evaluation of global model fit of nonlinear SEM] [Conference presentation]. 51st DGPS Congress, Frankfurt am Main, Germany.
1. Irmer, J. P., Kern, M., Semmer, N. K., & Zapf, D. (2015, September). Meta-analytical results on the challenge-hindrance-stressor concept using ISTA [Conference presentation]. 9th DGPS Work, Organizational, and Business Psychology Meeting, Mainz, Germany.

🎓 Colloquium Presentations

1. Irmer, J. P., Nehler, K. J., & Schultze, M. (2026, July 7). Can ordered-categorical data ever be treated as continuous? A population-level analysis of the impact of ordinal data on network analysis [Colloquium presentation]. Department of Evaluation, University of Freiburg.
1. Nehler, K. J., Irmer, J. P., & Schultze, M. (2026, June 30). Ordinale Daten als kontinuierlich behandeln: Konsequenzen für die Schätzung psychologischer Netzwerke [Treating ordinal data as continuous: Consequences for the estimation of psychological networks, Department colloquium presentation]. Department of Psychology, University of Erfurt.
1. Nehler, K. J., Irmer, J. P., & Schultze, M. (2026, June 10). Treating ordered-categorical data as continuous: Consequences for sparsity and edge weights in network analysis [Colloquium presentation]. Department of Psychological Methods with Interdisciplinary Focus, Goethe University Frankfurt.
1. Irmer, J. P. (2026, June 11). Ein bisschen KI schadet nie? – LLMs, Prompt Engineering und R-Workflows [A little AI never hurts? – LLMs, prompt engineering, and R workflows, Colloquium presentation]. Department of Evaluation, University of Freiburg. Materials
1. Irmer, J. P. (2026, May 11). Einführung in Simulationsstudien: Grundlagen und erste Schritte in R [Introduction to simulation studies: Foundations and first steps in R, Colloquium presentation]. Department of Evaluation, University of Freiburg.
1. Irmer, J. P. (2026, April 16). Control of baseline confounding in causal panel models: Analytical population-level analyses and simulation results [Colloquium presentation]. Department of Evaluation, University of Freiburg.
1. Irmer, J. P. (2026, February 16). Control of baseline confounding in causal panel models: Background and analytical extensions of the Dynamic Panel Model [Colloquium presentation]. Department of Evaluation, University of Freiburg.
1. Irmer, J. P. (2025, July 3). Beyond the prompt: Practical AI use in research and teaching [Colloquium presentation]. Department of Psychological Methods, Humboldt-Universität zu Berlin.
1. Irmer, J. P. (2025, May 15). From simulation studies to simulation-based power analysis: Tools for modern psychological research [Colloquium presentation]. Department of Psychological Methods, Humboldt-Universität zu Berlin.
1. Irmer, J. P. (2024, August 6). My dissertation and beyond [Colloquium presentation]. Department of Psychological Methods, Humboldt-Universität zu Berlin.
1. Irmer, J. P. (2022, June 22). Challenges in simulation studies with nonlinear effects, distributional misspecifications, and ordered-categorical data [Colloquium presentation]. Department of Psychological Methods and Evaluation, Goethe University Frankfurt.