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Tests of the Three-Path Mediated Effect
Aaron B. Taylor
Arizona State University
David P. MacKinnon
Arizona State University
Jenn-Yun Tein
Arizona State University
In a three-path mediational model, two mediators intervene in a series between an independent and a dependent variable. Methods of testing for mediation in such a model are generalized from the more often used single-mediator model. Six such methods are introduced and compared in a Monte Carlo study in terms of their Type I error, power, and coverage. Based on its results, the joint significance test is preferred when only a hypothesis test is of interest. The percentile bootstrap and bias-corrected bootstrap are preferred when a confidence interval on the mediated effect is desired, with the latter having more power but also slightly inflated Type I error in some conditions.
Key Words: mediation bootstrapping
This version was published on April
1, 2008
Organizational Research Methods, Vol. 11, No. 2,
241-269 (2008)
DOI: 10.1177/1094428107300344

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