Extended work in comparing item fit statistics and principal component analysis as tools for assessing the unidimensionality requirements of Rasch models and demonstrated methods to explore how violations of the unidimensionality requirement influence person measurement through 2 studies involving simulated rating scale data and responses to a…

Used Rasch measurement to study the psychometric properties of data obtained from a newly developed Diabetes Questionnaire designed to measure diabetes knowledge, attitudes, and self-care. Responses of 26 diabetes patients to the English version of the questionnaire and 24 patients to the Spanish version support the cross-form equivalence and…

Outlines methods in Rasch measurement that are used to gather evidence for reliability and validity and attempts to articulate how these methods may be linked with current views of reliability and validity. (SLD)

Explored the possibility of developing a common metric for measuring goal orientation by simultaneously calibrating four commonly used goal orientation scales to see if item responses met the unidimensionality requirement. Results for 305 psychology students in France yield a common metric for interpretation and statistical analyses. (SLD)

Describes problems in score reporting with the True Score model, defines the Rasch measurement unit (the logit), reviews transformations of the logit metric, and provides examples of score reporting procedures. Uses dichotomous data from an examination taken by 126 Ph.D. students and polychotomous data from a self-efficacy assessment completed by…

Explored the dimensionality of responses to the Adult Behavior Checklist-Revised, a screening assessment for Attention Deficit Hyperactivity Disorder (ADHA) in college students. Responses from 317 undergraduates were used, with 8 judges involved in standard setting. Findings show secondary variables that may have clinical implications. (SLD)