Psychometric Properties of the Outcome Rating Scale: An Item Response Theory Analysis. (3rd April 2021)

• Record Type: Journal Article
• Authors: Toland, Michael D.; Li, Caihong; Kodet, Jonathan; Reese, Robert J.
• Is Part Of: Measurement & evaluation in counseling & development. Volume 54:Number 2(2021)
• Page Start: 90
• Page End: 105
• Publication Date: 2021-04-03
• Subjects: Distress -- psychotherapy -- Outcome Rating Scale -- item response theory; Psychological tests -- Periodicals; Counseling -- Evaluation -- Periodicals; Counseling -- Periodicals; 361.060287
• DOI: 10.1080/07481756.2020.1745647
• Languages: English
• ISSNs: 0748-1756

Abstract

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.