Metric development and score reporting in Rasch measurement.

This article: 1) describes problems in score reporting with the True-Score Model, 2) presents a definition of the Rasch measurement unit, the logit, 3) reviews various transformations of the logit metric, and 4) provides examples of score reporting procedures. Two data sets are used. The first contains dichotomous data drawn from responses to a multiple-response statistics examination taken by Ph.D. students; the second contains polychotomous data from a self-efficacy assessment given to war veterans suffering from Post Traumatic Stress Disorder.