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Re: st: Problem recreating SE and CI using e(V) from logistic, stcox etc


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Problem recreating SE and CI using e(V) from logistic, stcox etc
Date   Thu, 29 Apr 2010 08:20:09 -0700 (PDT)

--- On Thu, 29/4/10, Lee, William wrote:
> I am wanting to extract figures from a regression model,
> but find large differences between the SE as calculated from
> the variance covariance matrix and that which appears in the
> output. First using stcox, and since replicated in logistic.
> What is odd is that the CIs (calculated from my SE) agree to
> many decimal places with each other. 

Here is at least a partial answer (why your method got the 
right confidence intervals):
http://www.stata.com/support/faqs/stat/2deltameth.html

Hope this helps,
Maarten

--------------------------
Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen
Germany

http://www.maartenbuis.nl
--------------------------


      

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