alexa Mediation in experimental and nonexperimental studies: new procedures and recommendations.
Psychiatry

Psychiatry

Journal of Depression and Anxiety

Author(s): Shrout PE, Bolger N

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Abstract Mediation is said to occur when a causal effect of some variable X on an outcome Y is explained by some intervening variable M. The authors recommend that with small to moderate samples, bootstrap methods (B. Efron & R. Tibshirani, 1993) be used to assess mediation. Bootstrap tests are powerful because they detect that the sampling distribution of the mediated effect is skewed away from 0. They argue that R. M. Baron and D. A. Kenny's (1986) recommendation of first testing the X --> Y association for statistical significance should not be a requirement when there is a priori belief that the effect size is small or suppression is a possibility. Empirical examples and computer setups for bootstrap analyses are provided.
This article was published in Psychol Methods and referenced in Journal of Depression and Anxiety

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