In the design of experiments and analysis of variance, a main effect is the effect of an independent variable on a dependent variable averaging across the levels of any other independent variables.
Regarding this, what is a main effect and an interaction effect?
Understanding Main Effects and Interactions. A main effect is the effect of a single independent variable on a dependent variable – ignoring all other independent variables. For example, imagine a study that investigated the effectiveness of dieting and exercise for weight loss.
What does a significant interaction mean?
When an interaction effect is present, the impact of one factor depends on the level of the other factor. Part of the power of ANOVA is the ability to estimate and test interaction effects. When interaction effects are present, it means that interpretation of the main effects is incomplete or misleading.
What is the main effect in psychology?
A 2 x 2 x 2 factorial design is a design with three independent variables, each with two levels. Main Effects. A “main effect” is the effect of one of your independent variables on the dependent variable, ignoring the effects of all other independent variables.