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st: AW: dtobit


From   "Martin Weiss" <martin.weiss1@gmx.de>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: AW: dtobit
Date   Wed, 8 Jul 2009 13:17:18 +0200

<> 

You do not have to rely on -dtobit- in Stata 10.1, though:

*************
sysuse auto, clear
generate wgt=weight/1000

vers 8.2
qui tobit mpg wgt, ll(17)
dtobit


vers 10.1
qui{
	loc lb 17
	tobit mpg wgt, ll(`lb')
}

mfx
mfx, predict(ystar(`lb',.))
mfx, predict(e(`lb',.))
mfx, predict(pr(`lb',.))
*************

Does anybody know why the standard errors are different?


HTH
Martin


-----Ursprüngliche Nachricht-----
Von: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von 21443017
Gesendet: Mittwoch, 8. Juli 2009 12:23
An: statalist@hsphsun2.harvard.edu
Betreff: st: dtobit

Dear All,

I have a problem of using dtobit. I am trying to estimate the marginal
effects after a tobit model by using dtobit. However, stata reports "[_se]
not found". What would be the problem?

The code I used is 

 tobit y x1 x2 x3 ll(0)
dtobit


Thanks for your help

Best
Wen


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