| Abstract: | Few studies in counseling and psychotherapy have investigated rater bias. The purpose of this study was to outline a method for studying rater bias. We studied three potential sources of rater bias: (a) characteristics of the rater, client, and therapist; (b) the similarity of characteristics between rater and therapist or client; and (c) perceived similarity between rater and therapist or client. We used a new rater-bias measure. The data for the study were ratings on the Collaborative Study Psychotherapy Rating Scale for 826 sessions of psychotherapy in the Treatment of Depression Collaborative Research Program. High interrater reliability was found for all scales of the measure. We found evidence of rater bias only on the facilitative conditions scale. Rater bias was not found for the other scales, perhaps because of the extensive development of the measure, careful selection of the raters, lengthy rater training, and continued contact with raters throughout the rating period. The rater-bias measure may be useful to other researchers as a means of testing the reactivity of their measures to rater bias. Finally, the method for investigating rater bias can be used by other researchers to evaluate rater bias. (PsycINFO Database Record (c) 2010 APA, all rights reserved) |
