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RE: st: ptrend for adjusted ORs


From   "Solis, Jennifer N" <Jennifer.N.Solis@uth.tmc.edu>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: ptrend for adjusted ORs
Date   Mon, 28 Aug 2006 10:24:20 -0500

Are you referring to the OR and P-value that is given after the ptl after the second logistic?

________________________________

From: owner-statalist@hsphsun2.harvard.edu on behalf of Svend Juul
Sent: Mon 8/28/2006 6:23 AM
To: statalist@hsphsun2.harvard.edu
Subject: Re: st: ptrend for adjusted ORs



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: +45 8942 6090
Home:  +45 8693 7796
Email: sj@soci.au.dk
__________________________________________

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