Psychometric Properties Of The Outcome Rating Scale: An Item Response Theory Analysis
MEASUREMENT AND EVALUATION IN COUNSELING AND DEVELOPMENT（2021）
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.
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Key words
Distress, psychotherapy, Outcome Rating Scale, item response theory
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