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Chapter 15 Mixed Models - CMU Statistics

Chapter 15 Mixed ModelsA flexible approach to correlated OverviewCorrelated data arise frequently in statistical analyses. This may be due to group-ing of subjects, , students within classrooms, or to repeated measurements oneach subject over time or space, or to multiple related outcome measures at onepoint in time. Mixed model analysis provides a general, flexible approach in thesesituations, because it allows a wide variety of correlation patterns (or variance-covariance structures) to be explicitly mentioned in Chapter 14, multiple measurements per subject generally resultin the correlated errors that are explicitly forbidden by the assumptions of standard(between-subjects) AN(C)OVA and regression Models .

that level into the \subjects" box. For our video game example this is the subject \id" column. For a classroom example in which we study many students in each classroom, this would be the classroom identi er. Figure 15.3: Specify Subjects and Repeated Dialog Box.

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