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Re: st: RE: Stata list example - use of the margins command


From   brendan.halpin@ul.ie (Brendan Halpin)
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: Stata list example - use of the margins command
Date   Fri, 09 Dec 2011 08:36:54 +0000

On Thu, Dec 08 2011, Peter Baade wrote:

> In the example below (with a reduced sample size) I generate the odds
> ratios using three methods, margins with nlcom, tabodds, and
> stratified logistic regression. While the ORs and standard errors are
> very similar, nlcom's confidence intervals seem to be incorrect.

nlcom seems to be generating CIs on the odds-ratio scale, i.e., OR +/-
z*SE, whereas the other methods CIs are on the log-odds-ratio scale
(back transformed), i.e. exp( log-OR +/- z*SE). The latter is better.

Brendan

-- 
Brendan Halpin,   Department of Sociology,   University of Limerick,   Ireland
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http://teaching.sociology.ul.ie/bhalpin/wordpress         twitter:@ULSociology
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