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st: xtreg main effect and interaction
From
Ricardo Ovaldia <[email protected]>
To
[email protected]
Subject
st: xtreg main effect and interaction
Date
Mon, 15 Aug 2011 05:33:24 -0700 (PDT)
I used -xtreg- to fit a random effect model on longitudinal data.
The model is of the form:
xi:xtreg Y i.group*time i.group x1 x2 ...
The group has three levels. I get a significant group effect (p=0.023) and a significant interaction (p<0.001). -time is also significant (p<0.001) . My questions are:
1. How to interpret the main group effect in the presence of the interaction? and
2. how do I estimate the size of the effect?
Thank you in advance,
Ricardo
Ricardo Ovaldia, MS
Statistician
Oklahoma City, OK
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