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SPSS Code Fragment: 
Simple Main Effects On Within Subjects Factors

Factors a and b are within subjects while factor c is between subjects. The a*b interaction is statistically significant and we want to do tests of simple main effects on differences in a within each level of b.

manova
  y1 y2 y3 y4 by c(1,2)
  /wsf = a(2) b(2)
  /wsd= b, a w b(1), a w b(2)
  /design c.

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