Effect size and power in assessing moderating effects of categorical variables using multiple regression: a 30-year review.

Volume: 90, Issue: 1, Pages: 94 - 107
Published: Jan 1, 2005
Abstract
The authors conducted a 30-year review (1969-1998) of the size of moderating effects of categorical variables as assessed using multiple regression. The median observed effect size (f(2)) is only .002, but 72% of the moderator tests reviewed had power of .80 or greater to detect a targeted effect conventionally defined as small. Results suggest the need to minimize the influence of artifacts that produce a downward bias in the observed effect...
Paper Details
Title
Effect size and power in assessing moderating effects of categorical variables using multiple regression: a 30-year review.
Published Date
Jan 1, 2005
Volume
90
Issue
1
Pages
94 - 107
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