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Dr. Wollack received his Ph.D. in Educational Psychology from the University of Wisconsin-Madison in 1996, and returned to the Department as an Associate Research Professor in 2006. Dr. Wollack also serves as the Director of UW-Madison’s Testing and Evaluation Services and the University of Wisconsin Center for Placement Testing (http://www.testing.wisc.edu/). Dr. Wollack teaches a research seminar course aimed at exposing quantitative methods doctoral students to current research and discussing design issues, possible extensions, and practical or theoretical implications of the research. In addition, Dr. Wollack leads numerous workshops throughout the year on topics such as test construction, grading, and assessment. He was elected as a Fellow in the University of Wisconsin Teaching Academy in 2005. RESEARCH STATEMENT “My research program has predominantly focused on applications of item response theory to improve the validity and interpretability of test scores. Much of my research has centered on aspects of test security, and most specifically, detection of cheating, including developing indexes for detecting answer copying, studying the properties of different indexes under various testing conditions, helping establish best practices for implementing cheating indexes, and identifying strategies for improving detection rates of true copiers. I am also interested in studying the effects of violating assumptions underlying common measurement models (e.g., item parameter drift, item misfit, and local item dependence) and developing approaches to mitigate these effects.” REPRESENTATIVE PUBLICATIONS Goegebeur, Y., DeBoeck, P., Wollack, J. A., & Cohen, A. S. (in press). A speeded item response model with gradual process change. Psychometrika. Cohen, A. S., & Wollack, J. A. (2006). Test administration, security, scoring, and reporting. In. R. L. Brennan (Ed.) Educational Measurement (4 th ed., pp. 355-386). Westport, CT: American Council on Education/Praeger. Wollack, J. A. (2006). Simultaneous Use of Multiple Answer Copying Indexes to Improve Detection Rates. Applied Measurement in Education, 19, 265-288. Wollack, J. A. (2003). Comparison of Answer Copying Indices on Real Data. Journal of Educational Measurement, 40, 189-205. Wollack, J. A., Cohen, A. S., & Wells, C. S. (2003). A method for maintaining scale stability in the presence of test speededness. Journal of Educational Measurement, 40, 307-330. Bolt, D. M., Cohen, A. S., & Wollack, J. A. (2002). Item parameter estimation under conditions of test speededness: Application of a mixture Rasch model with ordinal constraints. Journal of Educational Measurement39, 331-348. Wollack, J. A., Cohen, A. S., & Serlin, R. C. (2001). Defining error rates and power for detecting answer copying. Applied Psychological Measurement, 25(4), 385-404. Wollack, J. A. (1997). A nominal response model approach to detect answer coping. Applied Psychological Measurement, 21(4), 307-320.
CONTACT DR. WOLLACK Address: Room 373 Educational Sciences Building |
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