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st: diff-in-diff for panel count data?

From   "Heekyung \"Hellen\" Kim" <>
To   <>
Subject   st: diff-in-diff for panel count data?
Date   Sun, 16 Oct 2011 15:11:32 -0400

How do you implement diff-in-diff for panel on count data?

For example, I have D (1 for treatment group, 0 for control group) and T (1
after treatment, 0 before treatment).  Samples have different starting
years, though.

xtset ID year
gen DxT=D*T
xtnbreg y D T DxT i.start_year 

Would the above work?

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