st: generate standard errors for efficiency estimates in xtfrontier?

[walkercu@msu.edu]

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


*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/