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Re: st: Dummy variables

From   Maarten buis <>
Subject   Re: st: Dummy variables
Date   Tue, 13 Jul 2010 10:08:44 +0000 (GMT)

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

--- On Tue, 13/7/10, Frank Peter wrote:
> I am trying to replicate how Capon 2005 created dummy
> variables for 60 hospitals for logistic regression. 
> "A second model was fitted including all the variables
> selected by the stepwise model and 60 dummy variables
> identifying single hospitals. The dummy variables were coded
> in order to take the overall rate as a reference. Adjusted
> ORs were computed for every hospital. All analyses were
> carried out using STATA software version 8.0."
> I will be glad if someone can explain how create dummy
> variables that will include all the 60 hospitals, so that I
> can calculate the adjusted prevalence ratio for all.

Sounds like "effect coding", which has been implemented in
-xi3- (to install type in Stata -findit xi3-).

Hope this helps,


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