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Decomposing interactions using GLM in combination with the COMPARE, LMATRIX and MMATRIX subcommands in SPSS

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Doi: 10.20982/tqmp.08.1.p001

Howell, Glen T. , Lacroix, Guy L.
Keywords: ANOVA , interactions , GLM , SPSS
Tools: SPSS
(data file)   (Appendix)

In this tutorial, we provide researchers who use SPSS step-by-step instructions for decomposing interactions when a three-way ANOVA is conducted using the GLM procedure. We start with a demonstration of how a two-way interaction can be decomposed using the COMPARE subcommand in combination with syntax. Then, we provide instructions with examples for conducting simple interaction and second-order simple effects analyses for three-way ANOVAs with between-subjects, within-subjects, and mixed between- and within-subjects variables using the LMATRIX or MMATRIX subcommands. Provided in Appendices are general rules that can be used to derive design-specific LMATRIX and MMATRIX subcommands.

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