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Re: st: Change reference group in logistic regression

From   Maarten buis <>
Subject   Re: st: Change reference group in logistic regression
Date   Thu, 3 Feb 2011 14:57:23 +0000 (GMT)

--- On Thu, 3/2/11, Morten Stover wrote:
> I want to change reference group doing a logistic 
> regression analysis on highest level of education and
> future work disability. The data is coded 1=primary,
> 2 =secondary and 3=tertiary, and I would like tertiary 
> to be the reference group. I've done this in cox
> regression using char and [omit], but I can't get this
> to work in log reg. 

I am assuming you are using the -xi- prefix. I cannot 
replicate your problem. The example below works as 

*--------- begin example ----------
sysuse auto, clear
recode rep78 1/2=3

char rep78[omit] 5
xi: logit foreign i.rep78
*----------- end example -----------

Can you change the example above such that it reproduces
your problem? Seeing the problem on your own computer in 
examples like that really help in diagnosing the problem.

-- Maarten

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


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