Probing three-way interactions in moderated multiple regression: development and application of a slope difference test
- PMID: 16834514
- DOI: 10.1037/0021-9010.91.4.917
Probing three-way interactions in moderated multiple regression: development and application of a slope difference test
Abstract
Researchers often use 3-way interactions in moderated multiple regression analysis to test the joint effect of 3 independent variables on a dependent variable. However, further probing of significant interaction terms varies considerably and is sometimes error prone. The authors developed a significance test for slope differences in 3-way interactions and illustrate its importance for testing psychological hypotheses. Monte Carlo simulations revealed that sample size, magnitude of the slope difference, and data reliability affected test power. Application of the test to published data yielded detection of some slope differences that were undetected by alternative probing techniques and led to changes of results and conclusions. The authors conclude by discussing the test's applicability for psychological research.
((c) 2006 APA, all rights reserved).
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