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st: population attritutable risk fraction and xi in logistic regression
From
"Fitzmaurice, Ann E." <[email protected]>
To
"[email protected]" <[email protected]>
Subject
st: population attritutable risk fraction and xi in logistic regression
Date
Sat, 7 May 2011 15:09:58 +0100
Good afternoon
I would like to calculate the PAFR after logistic regression with and without interactions of the form-
Logistic dependent var1 list of variables var1*each of the variables in the list using xi
Var1 has four groups , and this is where I think the problem may be
The first problem got was that the use of xi did not like interactions (do not understand why), so I removed the interactions, but using aflogit, this couldn't find var1
This is the command I used
aflogit bir_grp2, cc
can anyone explain how to get this fraction from the adjusted model , can it be calculated in stata or by hand and if so does anyone have an example that I can follow
thanks
ann
Ann E Fitzmaurice
Medical Statistician
Immpact University of Aberdeen
Health Sciences Building
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Scotland
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Email: [email protected]
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