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Re: st: Predicted Odds Following Logistic Regression

From   Maarten buis <[email protected]>
To   [email protected]
Subject   Re: st: Predicted Odds Following Logistic Regression
Date   Mon, 17 Jan 2011 13:29:15 +0000 (GMT)

--- On Mon, 17/1/11, Melissa King wrote:
> Interestingly, three of the medical services in my model
> (SERVICE1, SERVICE2 and SERVICE3) are mutually exclusive,
> meaning that if you receive one of the three, you cannot
> be receiving the other two. Do you know if Stata will
> recognize this when I ask it to generate predicted odds?
> In other words, will it automatically "switch off"
> SERVICE2 and SERVICE3 in my logistic regression when
> SERVICE1 is "switched on?" And if I generate predicted
> odds for SERVICE1, and indicate that I want values held
> constant at the mean, will Stata fix SERVICE2 and SERVICE3
> at zero while holding all other variables constant at
> their means?

Stata will not do that automatically, because it does not 
know which variables are mutually exclusive and which not.
Say you want to controll for age, than I would type:

adjust age SERVICE2=0 SERVICE3=0, by(SERVICE1)

Hope this helps,

Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen


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