Dear Mclaren,
Thank you so much for the reply. Another model with four groups to explore D1A1-D1A2 difference looks like following set up, right?
D1A1 D1A2 D2A1 D2A2
1 0 0 0
1 0 0 0
0 1 0 0
0 1 0 0
0 0 1 0
0 0 1 0
0 0 0 0
0 0 0 0
contrast
C1 1 -1 0 0 D1A1 - D1A2
C2 -1 1 0 0 etc...
One more question regarding my previous model, is that possible if there is no significant t-test results when F test is significant? Thanks loads.
Joyce
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