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Interaction Effects in ANOVA

-1- Interaction Effects in ANOVAThis handout is designed to provide some background and information on the analysis andinterpretation of Interaction Effects in the Analysis of Variance ( ANOVA ). This is a complex topicand the handout is necessarily incomplete. In practice, be sure to consult the text and otherreferences on ANOVA (Kirk, 1982; Rosenthal & Rosnow, 1991; Stevens, 1990; Winer, Brown,& Michels, 1991) for additional Effects represent the combined Effects of factors on the dependent measure. When aninteraction effect is present, the impact of one factor depends on the level of the other factor. Partof the power of ANOVA is the ability to estimate and test Interaction Effects .

interaction effects are present, it means that interpretation of the main effects is incomplete or misleading. Kinds of Interactions. For example, imagine a study that tests the effects of a treatment on an outcome measure. The treatment variable is composed of two groups, treatment and control. The

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