Re: Ang. st: AW: var-covar matrix from logistic regression

[Jeph Herrin <junk@spandrel.net>]

*************
webuse lbw2, clear
logit low age lwt race2 race3 smoke ptl ht ui
matrix define V=e(V)
di V[1,1]
************


Tomas Lind wrote:
> Thanks for your answer.
>
> I was thinking about using variance-covariance coefficients in calculations
> or just display them like I can display:
>
> di exp(_b[smoke])
>
> /Tomas
>
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>           st: AW: var-covar matrix from logistic regression                        
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>           Martin Weiss                                                             
>                        till:                                                       
>                          statalist                                                 
>                                                                   2009-02-25 17:04 
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>           Sänt av:                                                                 
>                 owner-statalist@hsphsun2.harvard.edu                               
>          Svara till statalist                                                      
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> <>
>
> Re coefficients: what do you mean by "use betas in some calculations?"
>
> After estimation, you can access them as seen in the third line here. If
> you
> want to store them, i.e. turn the ephemeral "e(b)" into something longer
> lasting, see the fourth line.
>
> *************
> webuse lbw2, clear
> logit low age lwt race2 race3 smoke ptl ht ui
> di _b[age]
> matrix define A=e(b)
> *************
>
>
>
> HTH
> Martin
>
>
> -----Ursprüngliche Nachricht-----
> Von: owner-statalist@hsphsun2.harvard.edu
> [mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Tomas Lind
> Gesendet: Mittwoch, 25. Februar 2009 16:40
> An: statalist@hsphsun2.harvard.edu
> Betreff: st: var-covar matrix from logistic regression
>
> Dear Stata,
>
> I have done logistic regression with logit.
>
> How can I look at the variance-covariance matrix? I understand it is saved
> in something called e(b), but I can´t see it!
>
> Can I use one of the coefficients like it is possible to use betas in some
> calculations? How to do it!
>
> /Tomas
>
>
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