Michael D. Toland, Caihong R. Li, J. Kodet, R. J. Reese
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Psychometric Properties of the Outcome Rating Scale: An Item Response Theory Analysis
Abstract We assessed the psychometric properties of the visual analog scale (VAS) form of the Outcome Rating Scale (ORS) using item response theory (IRT) with a sample of 2,109 Canadian counseling clients. Findings indicate that the ORS was unidimensional and that the equal-interval assumption was not tenable for the VAS.
期刊介绍:
Measurement and Evaluation in Counseling and Development is an official journal of the Association of Assessment and Research in Counseling (AARC), a member association and division of the American Counseling Association. Articles range in appeal from those that deal with theoretical and other problems of the measurement specialist to those directed to the administrator, the counselor, or the personnel worker--in schools and colleges, public and private agencies, business, industry, and government. All articles clearly describe implications for the counseling field and for practitioners, educators, administrators, researchers, or students in assessment, measurement, and evaluation.