<>
You can specify the -force- option to -predictnl-, but at your own peril, as
the help file makes clear...
HTH
Martin
-----Ursprüngliche Nachricht-----
Von: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von
walkercu@msu.edu
Gesendet: Montag, 19. April 2010 14:45
An: statalist@hsphsun2.harvard.edu
Betreff: st: generate standard errors for efficiency estimates in
xtfrontier?
Hello everyone,
I am using -xtfrontier- to estimate technical efficiency, and I would
like to include the standard errors for the efficiency terms predicted.
I used the following commands:
.xtfrontier /depvar independentvars/, ti
.predict efficiency, te
But I can't figure out how to generate standard errors for the point
estimates. After reading through the help sections, I tried using
-predictnl-, with the following command:
.predictnl efficiency=predict(te), standerror(se)
But I received an error message:
"expression is a function of possibly stochastic quantities other
than e(b)"
I've searched the archives and the stata help files and haven't been
able to find an answer to this.
Thanks,
Curtis
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