A priori power analysis in longitudinal three-level multilevel models: an example with therapist effects.

Abstract

Over the last few years, three-level longitudinal models have become more common in psychotherapy research, particularly in therapist-effect or group-effect studies. Thus far, limited attention has been paid to power analysis in these models. This article demonstrates the effects of intraclass correlation, level of randomization, sample size, covariates and… (More)
DOI: 10.1080/10503300903376320

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