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Re: st: RE: Query: How do I test trend across i.v. categories within logistic?
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?
> > 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.
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Dr Naomi Steggles
Research Fellow HABIT study
Health Behaviour Unit
Department of Epidemiology and Public Health
University College London
2-16 Torrington Place
020 7679 6635
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