| factorial design | A design in which all levels of each independent variable are combined with all levels of the other independent variables. A factorial design allows investigation of the separate main effects and interactions of two or more independent variables.
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| interaction | The differing effect of one independent variable on the dependent variable, depending on the particular level of another independent variable.
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| IV x PV design | A factorial design that includes both an experimental independent variable (IV) and a nonexperimental participant variable (PV).
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| main effect | The direct effect of an independent variable on a dependent variable.
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| mixed factorial design | Adesign that includes both independent groups (between-subjects)and repeated measures (within- subjects) variables.
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| moderator variable | A variable that influences the nature of the relationship between two other variables (an independent variable and a dependent variable). In a factorial design, the effect of the moderator variable is revealed as an interaction.
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| simple main effect | In a factorial design, the effect of one independent variable at a particular level of another independent variable.
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