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| From | Jerry Slice <sholbrook07@gmail.com> |
| To | statalist@hsphsun2.harvard.edu |
| Subject | st: opreg and levpet not working |
| Date | Mon, 28 Feb 2011 22:55:01 -0500 |
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 * * 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/