Re: st: dtobit and tobcm in Stata 9

[Richard Williams <Richard.A.Williams.5@ND.edu>]

At 07:14 AM 6/8/2005 -0700, Alejandro Lopez-Feldman wrote:

> Dear all,
>
> I have tried to use dtobit and tobcm in Stata 9 but I get back the warning
>
> [_se] not found
>
> I guess something changed from 8 to 9 in the way in which standard errors
> are saved after tobit... I can get it to work if I set the version to 8.2
> but I was wondering if the authors of these ado files are on the list and
> if they are aware of the problem.
This little tidbit from the online help for -version- clarifies what the 
problem is.  If you set version to earlier than 9, then

"Commands tobit and cnreg revert to pre-Stata 9 logic in how e(b) and e(V) 
are stored. Results were stored in a single equation containing both 
coefficients and the ancillary variance parameter."

Similarly, the help says

"Commands ologit and oprobit revert to pre-Stata 9 logic in how e(b) and 
e(V) are stored.  Results were stored in two equations, with all cut points 
stored in the second."

Ergo, user-written post-estimation commands for -tobit-, -cnreg-, -ologit- 
and -oprobit- may be broken now.  You either need to use version control 
when running -tobit-, etc., or else the user-written commands have to be 
updated.  Or, you could maybe write a utility to rewrite e(b) and e(V) back 
into Stata 8 format.

Again, I wonder what was gained by reformatting e(b) and e(V) in Stata 9, 
but I suppose there was a reason for it.


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Richard Williams, Notre Dame Dept of Sociology
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