Stata The Stata listserver
[Date Prev][Date Next][Thread Prev][Thread Next][Date index][Thread index]

st: offsets


From   paul.silcocks@sth.nhs.uk
To   statalist@hsphsun2.harvard.edu
Subject   st: offsets
Date   Tue, 22 Jul 2003 12:38:18 +0100

Is it possible to have more than one offset in a logistic (or other)
regression model?

Specifically I have an ordered categorical variable representing levels of a
clinical scoring system.  I want to see what the added value of a new
variable is, but I want to constrain the regression coefficients for the
levels of the categorical variable to be unity.

these are approaches I tried (dep is the ordered categorical variable) -
none of which work:

xi: logistic outcome1 i.dep ageatmi, offset(i.dep)

logistic outcome1  _Idep_1 _Idep_2 _Idep_3 _Idep_4 ageatmi, offset( _Idep_1
_Idep_2 _Idep_3 _Idep_4)

logistic outcome1  _Idep_1 _Idep_2 _Idep_3 _Idep_4 ageatmi, offset( _Idep_1)
offset( _Idep_2) offset( _Idep_3) offset( _Idep_4)

Any thoughts?

Paul Silcocks MSc, BM BCh, FRCPath, MFPHM, CStat
Assistant Director (Research & Intelligence)
Trent Cancer Registry

Tel: 0114 226 3416
Fax: 0114 226 3436
E-mail: paul.silcocks@sth.nhs.uk
website: www.trentcancer.nhs.uk


*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/



© Copyright 1996–2014 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   What's new   |   Site index