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Polak, Marike

Item analysis of unipolar item response data

Marike Polak (PhD student)
Psychometrics and Research Methodology
Department of Psychology
Faculty of Social and Behavioral Sciences
Leiden University
P.O. Box 9555
2300 RB Leiden
Phone: +31 71 527 3663 / 3761 (secretary)
E-mail: Marike Polak

Supervisor: Prof. dr W.J. Heiser
Project running from: 1 December 2002 – 10 September 2008

Summary

The project aims at contributing to the development of a full-blown item analysis of unipolar (single-peaked) items. Correspondence analysis will be used as a method for the multidimensional representation of item response data, and a coefficient of single-peakedness will be developed that measures the strength of the nonlinear relationship between item responses and person scores (or item scores). This coefficient will also be used to define a measure of reliability. The new methodology will be tested on a number of clinical test data, as well as on simulated data.

Date of defence:
Title of thesis: