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### Chapter ThirteenSimple Mixed Design

#### 13.1Combining between-subjects and within-subjects factors

A mixed design is one that contains at least one between-subjects independent variable and at least one within-subjects independent variable. In a simple mixed design, there are only two independent variables, one a between-subjects factor and the other a within-subjects factor; these variables are combined factorially. The number of levels of each independent variable is not constrained by the design. Thus, we could have a 2 × 2, a 4 × 3, or even a 3 × 7 factorial design. Chapters 14 and 15 will address two complex mixed designs that contain three independent variables.

Because there are two independent variables, there are three effects of interest: ...

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