Validity shrinkage in psychopathology research: An example of the need for caution

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Suggests that multivariate methods can easily be misapplied, often producing spurious results. A problem of particular relevance to psychopathology research, in which sample sizes are typically small, is that of validity shrinkage. A study of verbal mediation in young boys by B. W. Camp (see record 1978-31911-001) is analyzed to illustrate the magnitude of this problem, and several other illustrative studies are cited. (17 ref) (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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