extended · other · 2010

Rasch Model

Trevor G. Bond

<jats:title>Abstract</jats:title> Proponents of the Rasch model (RM; Rasch, 1980) claim that it is distinctive in terms of its focus on the production of interval‐level measurement (Andrich, 1988). There is an important emphasis that tests and questionnaires should produce data that fit the model, and the RM sets out the criteria for successful measurement. From that perspective, the Rasch model is indispensable for the construction of invariant measurement scales and the monitoring of their performance across samples and over time, as in the calibration of large item banks. The RM is widely adopted in educational and psychological testing as well as for rehabilitation and quality‐of‐life indicators in health settings.