Dr. Carmen Köhler

Projects

• BKE – Assessing Professional Skills

Academic and professional career

Professional Career

Since 01/2016	Research assistant at the department of Educational Measurement at the DIPF (Advisor: Johannes Hartig)
06/15 – 08/15	Internship at the Educational Testing Service (ETS), Princeton, NJ
2012 – 2015	Research assistant in the research project “Modeling Missing Data in Competence Tests” of the Priority Programme “Education as a Lifelong Process” (founded by the German Research Foundation [DFG]; PO1655/1-1)
2011 – 2012	Tutor for statistics in SPSS im Fachbereich Psychologie der Universität Trier

Education

2012 – 2015	PhD student; dissertation topic: "Isn’t Something Missing? Latent Variable Models Accounting for Item Nonresponse", Freie Universität Berlin (Advisors: Steffi Pohl & Claus H. Carstensen)
2007 – 2012	Psychology Major, University of Trier

Research Interests

• Dealing with missing responses in large scale assessments
• Item Response Theory
• Hierarchical linear modeling (HLM) 
• Generalized linear models (GLM)

Memberships

• German Psychological Society (DGPs)

Teaching

Teaching

SS 2017	Lecture „Statistics for Psychologists, Consolidation“ (Goethe University Frankfurt)
SS 2014	Seminar IRT-Models: Theory and application
WS 2012/2013	Seminar "Applied Statistics I" (University Bamberg)
SS 2013	Seminar "Applied Statistics II" (University Bamberg)

Workshops

09/2017	Workshop „Introduction to IRT” at the Institut for Educational Quality Improvement (IQB), Berlin, Germany
01/2015	Workshop „Introduction into Item Response Theory” at the International Centre for Higher Education Research (INCHER), Kassel, Germany

Publications

• Publications (DIPF database of publications)

• List of publications (pdf)
  

Journal Articles

• Köhler, C., Pohl, S., & Carstensen, C. H. (2017). Dealing with item nonresponse in large-scale cognitive assessments: The impact of missing data methods on estimated explanatory relationships. Paper accepted for publication in the Journal of Educational Measurement.
• Köhler, C., & Hartig, J. (2017). Practical significance of item misfit in low-stakes educational assessment. Applied Psychological Measurement. doi: 10.1177/0146621617692978
• Köhler, C., Pohl, S., & Carstensen, C. H. (2015). Investigating mechanisms for missing responses in competence tests. Psychological Test and Assessment Modeling, 57, 499-522.
• Köhler, C., Pohl, S., & Carstensen, C. H. (2015). Taking the missing propensity into account when estimating competence scores – Evaluation of IRT models for non-ignorable omissions. Educational and Psychological Measurement, 75, 850-874. doi: 10.1177/0013164414561785

Dissertation thesis

• Köhler, C. (2017). Isn’t something missing? Latent variable models accounting for item nonresponse. Ph.D. thesis, Freie Universität Berlin.

Diploma thesis

• Köhler, C. (2012). Kann das Rasch-Modell Abweichungen bei der Vorhersage von Psychotherapieverläufen erklären? Unpublished diploma thesis, University of Trier.

Presentations

• Köhler, C., Robitzsch, A., & Hartig, J. (2017, September). A bias corrected RMSD item fit statistic: An evaluation and comparison to alternatives: Study 2. Presentation at the 13th conference of the special interest group Methods and Evaluation (FGME) of the German Psychological Society DGPs, Jena, Germany.

• Hartig, J., Köhler, C., & Robitzsch, A. (2017, September). A bias corrected RMSD item fit statistic: An evaluation and comparison to alternatives: Study 1. Presentation at the 13th conference of the special interest group Methods and Evaluation (FGME) of the German Psychological Society DGPs, Jena, Germany.

• Köhler, C., Robitzsch, A., & Hartig, J. (2017, July). A bias corrected RMSD item fit statistic: An evaluation and comparison to alternatives. Presentation at the International Meeting of the Psychometric Society (IMPS), Zürich, Switzerland.

• Hartig, J., Köhler, C., & Naumann, A. (2017, July). Using Multilevel Logistic Regression to Detect Item Difficulty Variance Between Random Groups. Presentation at the International Meeting of the Psychometric Society (IMPS), Zürich, Switzerland.

• Köhler, C., & Hartig, J. (2016, September). Itemfit Statistiken und deren praktische Auswirkungen auf echte Daten. Presentation at the 50th Congress of the German Society of Psychology, Leipzig, Germany.
• Köhler, C., & Hartig, J. (2016, July). Practical significance of item misfit in educational large-scale assessment studies. Presentation at the 7th European Congress of Methodology of the European Association of Methodology (EAM), Mallorca, Spain.
• Köhler, C., Pohl, S., & Carstensen, C. H. (2016, April). Latente Ansätze zum Umgang mit fehlenden Werten in Kompetenztestdaten. Presentation at the 12th conference of the Austrian Psychological Society (ÖGP), Innsbruck, Austria.
• Pohl, S., Köhler, C., & Carstensen, C. H. (2016, April). Performance of missing data approaches in retrieving group-level parameters. Presentation at the NCME 2016 Annual Meeting, Washington, DC, USA.
• Carstensen, C. H., Köhler, C., & Pohl, S. (2015, September). Der Einfluss verschiedener Ansätze zum Umgang mit fehlenden Werten auf Zusammenhangsanalysen. Presentation at the 8th Congress of the DGfE-Section "Empirical Measurement" & the 80th Congress of the special interest group Empirical Padagogical Research (AEPF) of the German Psychological Society DGPs, Göttingen, Germany.
• Köhler, C., Pohl, S., & Carstensen, C. H. (2015, September). Performance of missing data approaches in retrieving group-level parameters. Presentation at the 12th conference of the special interest group Methods and Evaluation (FGME) of the German Psychological Society DGPs, Jena, Deutschland.
• Köhler, C., Gu, L., Ho, T.-H., & Zu, J. (2015, Juli). Issues of Applying Multidimensional Item Response Theory in Practice. Presentation at the Educational Testing Service (ETS) final internship meeting, Princeton, NJ.
• Köhler, C., Pohl, S., & Carstensen, C. H. (2014, December). Missing responses in competence tests. Presentation at the final conference of the first funding phase of the SPP1646 Priority Programme „Education as a lifelong process“, Bamberg, Germany.
• Köhler, C. (2014, September). Die Plage der fehlenden Werte. Science slam presentation at the 49th Congress of the German Society of Psychology, Bochum, Germany.
• Köhler, C., Pohl, S., & Carstensen, C. H. (2014, September). Umgang mit fehlenden Werten in Kompetenztestdaten. Presentation at the 49th Congress of the German Society of Psychology, Bochum, Germany.
• Köhler, C., Pohl, S., & Carstensen, C. H. (2014, July). Investigating the mechanisms for missing responses in competence tests. Presentation at the 6th European Congress of Methodology of the European Association of Methodology (EAM), Utrecht, Netherlands.
• Köhler, C., Pohl, S., & Carstensen, C. H. (2014, April). Investigating mechanisms for missing responses in competence tests. Presentation at the 2nd colloquium of the SPP1646 Priority Programme „Education as a lifelong process“, Florece, Italy.
• Köhler, C., Pohl, S., & Carstensen, C. H. (2014, March). Untersuchung der Tendenz zu fehlenden Werten in Kompetenztests. Presentation at the 2nd conference of the Society for Educational Research (GEBF), Frankfurt a.M., Germany.
• Köhler, C., Pohl, S., & Carstensen, C. H. (2013, September). Taking the tendency to omit items into account when estimating competence scores. Presentation at the SPP1646 Summer School „Educational Trajectories and Competence Development – Theoretical Concepts and Methodological Implementations“, Bamberg, Germany.
• Köhler, C., Pohl, S., & Carstensen, C. H. (2013, September). Berücksichtigung der Tendenz zum Überspringen von Aufgaben bei der Schätzung von Kompetenzwerten . Presentation at the 11th conference of the special interest group Methods and Evaluation (FGME) of the German Psychological Society (DGPs), Klagenfurt, Austria.
• Köhler, C., Pohl, S., & Carstensen, C. H. (2013, April). Investigation of the tendency to omit items in competence tests. Presentation at the 1st colloquium of the SPP1646 Priority Programme „Education as a lifelong process“, Bamberg, Germany.
• Köhler, C., Pohl, S., & Carstensen, C. H. (2013, March). Untersuchung der Tendenz zum Überspringen von Aufgaben in Kompetenztests. Presentation at the 1st young academics conference of the Society for Educational Research (GEBF), Kiel, Germany.
• Pohl, S., Carstensen, C. H., & Köhler, C. (2012, May). Modeling missing data in competence tests. Presentation at the opening meeting of the SPP1646 Priority Programme „Education as a lifelong process“, Bamberg, Germany.