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Inference in PROC COUNTREG

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Inference in PROC COUNTREG

Hello,

I am using PROC COUNTREG to do a zero-inflated negative binomial regression. Inference for this model is given in terms of an "approximate" p-value based on an asymptotic t-distribution.

What I don't understand is where this inference comes from. Is this based on multipurpose asymptotic theory for generalized linear models?

Thanks,
Byran Smucker
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