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


From   Tomas Lind <tomas.lind@sll.se>
To   statalist@hsphsun2.harvard.edu
Subject   Ang. st: AW: var-covar matrix from logistic regression
Date   Wed, 25 Feb 2009 17:13:03 +0100

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






                                                                                   
                                                                                   
                                                                                   
          st: AW: var-covar matrix from logistic regression                        
                                                                                   
                                                                                   
          Martin Weiss                                                             
                       till:                                                       
                         statalist                                                 
                                                                  2009-02-25 17:04 
                                                                                   
                                                                                   
                                                                                   
                                                                                   
          Sänt av:                                                                 
                owner-statalist@hsphsun2.harvard.edu                               
         Svara till statalist                                                      
                                                                                   
                                                                                   
                                                                                   





<>

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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