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Main effect is the term used in research methods for the effect that is produced by the average of an independent variable that has been produced over another independent variable. For example, the independent variable A is paired with independent variable B to produce the main effect.
- McBurney, D.M., White, T.L. (2004). Research Methods. CA: Wadsworth Learning.
- Mook, Douglas G. (2001). Psychological Research: The Ideas Behind the Methods. NY: W. W. Norton & Company.