Statalist The Stata Listserver


[Date Prev][Date Next][Thread Prev][Thread Next][Date index][Thread index]

Re: st: ptrend for adjusted ORs


From   "Svend Juul" <SJ@SOCI.AU.DK>
To   <statalist@hsphsun2.harvard.edu>
Subject   Re: st: ptrend for adjusted ORs
Date   Sun, 27 Aug 2006 17:58:13 +0200

Jennifer wrote:

I am trying to calculate the ptrend for an adjusted OR.
I know that the command ptrend or ptrendi works for my
crude OR, but is there a way to include the other
variables that I am adjusting with.
----------------------------------------------------

Try this:
    webuse lbw.dta, clear
    xi: logistic low i.ptl i.race i.smoke
    xi: logistic low ptl i.race i.smoke

The first -logistic- command displays the 4-category
-ptl- as 3 dummy variables. In the second you get a
single OR, and it can be interpreted as a trend test,
adjusted for race and smoke.

Hopes this helps

Svend

________________________________________________________

Svend Juul
Institut for Folkesundhed, Afdeling for Epidemiologi
(Institute of Public Health, Department of Epidemiology)
Vennelyst Boulevard 6
DK-8000 Aarhus C,  Denmark
Phone, work:  +45 8942 6090
Phone, home:  +45 8693 7796
Fax:          +45 8613 1580
E-mail:       sj@soci.au.dk
_________________________________________________________

*
*   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