Evaluating intraindividual change

Author(s): Hannover, W., Telser, C., Kriebel, R.

Journal/Book: Z Klin Psychol Forsch Praxis. 1997; 26: Rohnsweg 25, D-37085 Gottingen, Germany. Hogrefe-Verlag GmbH & Co. 291-299.

Abstract: Grawe and Braun (1994) proposed a computerized procedure for evaluating therapy effects, which is based on difference scores. However, in this procedure a post-pre-difference which is due only to measurement error may look as big as a post-pre-difference based on perfectly reliable measurements. Therefore, we propose two simple alternative indices which rake into account the problem of measurement error. The first allows a simple evaluation of the statistical significance of change, the second serves to describe the degree of change in units of the pretest standard deviation. Finally, we present a simple modification of these indices taking into account not only the problem of measurement error, but also the problem of situational and/or interactional effects.

Note: Article Steyer R, Univ Jena, Inst Psychol, Lehrstuhl Methodenlehre & Evaluat Forsch, Am Steiger 3, Haus 1, D-07743 Jena, GERMANY

Keyword(s): evaluation; psychotherapy research; measurement of change; reliability; consistency; state-trait models; PSYCHOTHERAPY

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