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_aMallinckrodt, Brent.
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_aAdvances in testing the statistical significance of mediation effects.
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_aunmediated
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_aABSTRACT : P. A. Frazier, A. P. Tix, and K. E. Barron (2004) highlighted a normal theory method popularized by R. M. Baron and D. A. Kenny (1986) for testing the statistical significance of indirect effects (i.e., mediator variables) in multiple regression contexts. However, simulation studies suggest that this method lacks statistical power relative to some other approaches. The authors describe an alternative developed by P. E. Shrout and N. Bolger (2002) based on bootstrap resampling methods. An example and step-by-step guide for performing bootstrap mediation analyses are provided. The test of joint significance is also briefly described as an alternative to both the normal theory and bootstrap methods. The relative advantages and disadvantages of each approach in terms of precision in estimating confidence intervals of indirect effects, Type I error, and Type II error are discussed.
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_aStatistics.;Bootstrap (Statistics).;Resampling (Statistics).;Statistical power analysis.
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_gv. 53 no. 3 (Jul. 2006) pp. 372-378.
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