Polytomous Rasch Models in Counseling Assessment

ABSTRACT

This article provides a brief introduction to the Rasch model. Motivation for using Rasch analyses is provided. Important Rasch model concepts and key aspects of result interpretation are introduced, with major points reinforced using a simulation demonstration. Concrete guidelines are provided regarding sample size and the evaluation of items.

KEYWORDS:

• Rasch measurement
• partial credit model
• polytomous items

Additional information

Notes on contributors

John T. Willse

John T. Willse is an Associate Professor of Educational Research Methodology at the University of North Carolina at Greensboro. His research focuses on psychometrics, mixture measurement models, and diagnostic classification models.