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Zero inflated poisson: writing contrast and estimate statements in GENMOD

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Zero inflated poisson: writing contrast and estimate statements in GENMOD

Hi,

I have a problem with writing the contrast and estimate statement for zero inflated poisson model in proc GENMOD. The genmod book excerpt talks about
contrast only for individual class variables. Could any one tell me how to write the contrast statement for interactions of class variables (2,3 ,4 and 5 way interactions).

I have five class variables. A,B, C, D,E
A has 3 levels, B has 4 levels, C has two levels, D has 3 levels and E has 2 levels.
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