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RE: st: Estimates save and lincom - Stata10


From   "Newson, Roger B" <r.newson@imperial.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: Estimates save and lincom - Stata10
Date   Wed, 7 Nov 2007 19:16:45 -0000

Many thanks to Austin for this very useful -lincom- tip.

Roger


Roger Newson
Lecturer in Medical Statistics
Respiratory Epidemiology and Public Health Group
National Heart and Lung Institute
Imperial College London
Royal Brompton campus
Room 33, Emmanuel Kaye Building
1B Manresa Road
London SW3 6LR
UNITED KINGDOM
Tel: +44 (0)20 7352 8121 ext 3381
Fax: +44 (0)20 7351 8322
Email: r.newson@imperial.ac.uk 
Web page: www.imperial.ac.uk/nhli/r.newson/
Departmental Web page:
http://www1.imperial.ac.uk/medicine/about/divisions/nhli/respiration/popgenetics/reph/

Opinions expressed are those of the author, not of the institution.

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Austin Nichols
Sent: 07 November 2007 17:03
To: statalist@hsphsun2.harvard.edu
Subject: Re: st: Estimates save and lincom - Stata10

Try
lincom _b[urban]+_b[age], eform

On 11/7/07, Spörri-Fahrni Adrian <spoerri@ispm.unibe.ch> wrote:
> Dear statalisters
>
> Estimate save is a great command when your regressions run for a long time and you want to do some post estimations later on. Often I use lincom after an estimation command. However, it doesn't work properly after estimates use...
>
> Here's an example:
>
> version 10
> use http://www.stata-press.com/data/r10/bangladesh.dta, clear
> logistic c_use urban age child*
> estimates save bangla1 , replace
>
> logistic c_use urban age
> estimates save bangla2 , replace
>
> clear all
>
> estimates use bangla1
> estimates store bangla1
> estimates use bangla2
> estimates store bangla2
>
> * the likelihood-ratio test works fine:
> lrtest bangla1 bangla2
>
> * but the lincom does not work (if the original dataset is not loaded):
> lincom urban+age, eform
>
> * a workaround is to create two empty variables:
> gen urban=.
> gen age=.
> lincom urban+age, eform
>
> Is there another way of using lincom after estimates use - without creating empty variables or loading the data?
>
> Thanks,
> Adrian
> spoerri@ispm.unibe.ch
>
>
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