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Here are my experimental factors:

  • within-factor (two levels): time1, time2.
  • between factor (four levels): 4 groups.

I want to test specific post-hoc contrasts comparing:

  1. group1: time1 vs. time2
  2. group2: time1 vs. time2
  3. group3: time1 vs. time2
  4. group4: time1 vs. time2

to determine if and which group the time factor affects.

SPSS only provides an overall within effect for time averaging 4 groups. Moreover, SPSS only provides post-hoc contrasts for the between groups averaging time

How can I do my specific contrasts?

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