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st: Frontier,stata 8 & stata 9
I am running the following frontier regression and insert covariates in the
one sided error term U that captures inefficiency effects.
I thus run the following
frontier logoutput logcorarea loglabour logmanure logfertiliserval logtrac
logox logirrigation cropdum, uhet(experience age corarea, noconstant).
1. In stata SE 8.1 I confront an error with the noconstant option. It gives
me an error- noconstant invalid. This is a syntax problem and I have looked
at the stata 8 manuals and as far I understand this is the correct way. Does
anyone know better?
2. I am also running into convergence problems with my frontier iterations.
I decided to assign a lower tolerance level of ltolerance(1e-4) which works
in stata SE8.1 but refuses to converge when I use stata 9 in the office. I
tried 1e-7 for stata 9 but it did not work either in stata 9. Does anyone
have a solution to the convergence problem in stata 9?
Thank you in advance.
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