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st: Regression analyses for matched data

From   Pooja Desai <>
Subject   st: Regression analyses for matched data
Date   Fri, 25 Oct 2013 00:28:59 -0500

Hello Statalisters,

I have data which has patients on antipsychotic medications. There are two
groups: cases--on multiple antipsychotics and controls--on single
antipsychotics. The two groups are matched (1:1 match) based on their
duration of exposure to an antipsychotic. I want to run some regression
models on them to look at cost and healthcare utilization outcomes. I am
not sure if I should use xtgee (since it is correlated data) or glm with
vce(cluster clustervar).

Another followup question is that I have one count outcome which has many
zeros. If I do use xtgee, is there a way to carry out zero inflated Poisson
or zero inflated negative binomial regression using it?

Any advice will be appreciated.

Thanks in advance.

Pooja Desai
Health Outcomes and Pharmacy Practice
The University of Texas at Austin
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