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Re: st: RE: Query: How do I test trend across i.v. categories within logistic?


From   "N.Steggles" <n.steggles@public-health.ucl.ac.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: Query: How do I test trend across i.v. categories within logistic?
Date   Mon, 7 Oct 2002 16:57:58 GMT0

Dear Nick,
Thanks for the suggestion, however, replacing the 4df quintiles 
version of the variable by a 1df linear version results in a different 
model.  What I want to do is replace it by a set of polynomial 
orthogonal dummy variables totalling 4df as can be done in SPSS.
Can you tell me how to do this in STATA?

> N.Steggles
> > 
> > I am using the following command on my data set, and now wish to 
> > test for linear trend across categories of townquin?
> > 
> > xi: logistic trier agey7 i.etnicwh i.townquin, cluster(school)
> 
> Presumably you should now think of using not 
> i.townquin but townquin in the model. 
> 
> Nick 
> n.j.cox@durham.ac.uk 
> 
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Dr Naomi Steggles
Research Fellow HABIT study
Health Behaviour Unit
Department of Epidemiology and Public Health
University College London
Brook House
2-16 Torrington Place
London, UK
WC1E 6BT
020 7679 6635
Naomi@public-health.ucl.ac.uk
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