I am not sure what you mean by "overall LINER effect of spl". If you are referring to the test for the SPL effect, then you can examine the Type 3 Tests for Fixed Effects table to see it. It might show a 4df test. So it is not that straightforward to use the ESTIMATE statement to reproduce the test. But if you wish to do so, you can add the E3 option in the MODEL statement in PROC GLIMMIX, and see exactly how the test was performed, then use the ESTIMATE statement to reproduce the test based on the E3 option output.
You would follow the same approach for the second test you requested. Again, it would be a multiple-degree-of-freedom test.
For the third and fourth tests, if I can rephrase your "spl effect" to "the difference in the mean response", then the following ESTIMATE statements might work for your third tests --
estimate 'difference between -1.5 and 0 for IV=-1' spl[1, 0][-1, -1.5] IV*spl[1, 1 0][-1, 1 -1.5 ]; estimate 'differnece between -1.5 and 0 for IV=1' spl[1, 0][-1, -1.5] IV*spl[1, 2 0][-1, 2 -1.5];
You can write the similar ESTIMATE statements for your fourth test.
I hope this helps,
Jill
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