st: RE: opreg and levpet not working

[Jan Bryla <JBR@finansraadet.dk>]

Jerry,

Regarding the -levpet- procedure I encountered something similar, but it turned out that the reason was that I had not placed the nllp_bs_gmm.ado file in the appropriate directory. Placing it in ".../ado/plus/n" did the trick. I haven't encountered the problem with -opreg- to which you are refering - sorry!

Hope this helps

Jan Bryla
The Danish Bankers Association


-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Jerry Slice
Sent: 1. marts 2011 04:55
To: statalist@hsphsun2.harvard.edu
Subject: st: opreg and levpet not working

I'm trying to estimate a production function using opreg to control for selection, and levpet without the selection control. Using Stata 11.1, I get the following error on both of them:

(levpet) no observations
error #2000 occurred in program nllp_bs_gmm

(opreg) no observations
an error occurred when bootstrap executed opreg

The commands I am using are:
opreg sales, exit(exit) state(cap) proxy(inv) free(emp)
levpet sales, free(emp) proxy(inv) capital(cap) revenue

I have no missing data values, so I don't understand what the issue is here. There are no mis-casts as strings, and everything is properly formatted. Does anyone know how to fix this issue?

Thanks,
Jerry
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