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Re: st: interaction terms between binary and continuous variables in logistic regression
From
Maarten Buis <[email protected]>
To
[email protected]
Subject
Re: st: interaction terms between binary and continuous variables in logistic regression
Date
Thu, 26 May 2011 16:29:57 +0200
On Thu, May 26, 2011 at 4:10 PM, Philippe Girault <[email protected]> wrote:
> I would need help with interaction terms and lincom command with STATA 11. Let’s say that the model (random effects logistic regression) includes a binary covariate labelled “drug” (0/1), a continuous variable “visit” from 0 (baseline visit) to 24, and one interaction between these 2 covariates (p<0.05).
>
> For the slope, i used the following lincom syntax: lincom visit + c.visit#1.drug, or
>
> Now, I would like to know the OR of drug use at visit 12. What would be the syntax for the lincom?
lincom 1.drug + 12*c.visit#1.drug, or
Hope this helps,
Maarten
--------------------------
Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen
Germany
http://www.maartenbuis.nl
--------------------------
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