Dependability of measurement in counseling psychology: An introduction to generalizability theory

Author(s): Melby, J. N.

Journal/Book: Couns Psychol. 1999; 27: 2455 Teller Rd, Thousand Oaks, CA 91320, USA. Sage Publications Inc. 325-352.

Abstract: Classical approaches to the assessment of reliability neglect to take into account multiple sources of error and to consider diverse measurement contexts. Generalizability theory (GT) offers a flexible framework for assessing dependability of measurement. With GT investigators can estimate the total proportion of variance in ratings that is due to error rather than focusing on one source of error at a time. Simultaneous consideration of multiple sources of error allows investigators to assess the overall impact of measurement error in terms of attenuation of study findings and reduction of statistical power Estimation of variance components allows for flexible application of findings to a variety of possible future research designs. Illustrative analyses demonstrate the special advantages of GT for planning studies in which observer ratings will be used.

Note: Article Hoyt WT, Iowa State Univ Sci & Technol, Dept Psychol, W112 Lagomarcino Hall, Ames,IA 50011 USA

Keyword(s): INTEROBSERVER AGREEMENT; RELIABILITY; RATINGS; JUDGMENTS

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