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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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Notes on contributors
Michael D. Toland
Michael D. Toland, Caihong Li, Jonathan Kodet, and Robert J. Reese are in the Department of Educational, School, and Counseling Psychology at the University of Kentucky.
Jonathan Kodet
Michael D. Toland, Caihong Li, Jonathan Kodet, and Robert J. Reese are in the Department of Educational, School, and Counseling Psychology at the University of Kentucky.
Robert J. Reese
Michael D. Toland, Caihong Li, Jonathan Kodet, and Robert J. Reese are in the Department of Educational, School, and Counseling Psychology at the University of Kentucky.