Multivariate, Replicated, Single‐Subject, Repeated Measures Designs and P‐Technique Factor Analysis A Review of Intraindividual Change Studies

Abstract

The precise, quantitative portrayal of intraindividual change is a key goal of developmental researchers. Research designs particularly appropriate to selected aspects of this goal are multivariate, replicated, single‐subject, repeated measures (MRSRM) designs. Data collected with these designs may be factor analyzed with P‐technique factor analysis to elucidate, for each individual studied, patterns of systematic change. The nature of the factor patterns obtained for each individual can then be compared across individuals to determine the relative idiosyncrasy or generality of patterns of change. This paper extends an earlier review (Luborsky & Mintz, 1972) of studies using multivariate, single‐subject, repeated measures designs and P‐technique factor analysis. The emphasis here is on both more recent studies and the value of subject replication in creating a confluence of idiographic and nomothetic approaches to the study of behavior and behavioral development across the lifespan.

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