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RE: st: RE: Frontier,stata 8 & stata 9
Dear Scott,
Thank you for your response.
I tried the difficult option before but it had not worked. I even looked at
the gradient vector to see where it nears zero. It does near zero after
several iterations and i thought that since the gradient does not change
perhaps I can take that as a cue to stop the iterations at that point.
Alternatively, I could arbitrarily set the iterations to a maximum of say
500 and then take the values at that point.
Regarding the maximsation problem, I am not aware of this.. where can i get
more information on this?
I guess you do not know have an answer for the stata 8 question where i get
a "invalid noconstant" response to my equation:
frontier logoutput logcorarea loglabour logmanure logfertiliserval logtrac
logox logirrigation cropdum, uhet(experience age corarea, noconstant).
I tried eliminating the space and inserting square brackets, but no show.
Thank you for advice.
Regards,
Gauri
PS this message was resent as I lost my earlier response. Sorry if it
reaches you twice.
From: "Scott Merryman" <[email protected]>
Reply-To: [email protected]
To: <[email protected]>
Subject: st: RE: Frontier,stata 8 & stata 9
Date: Fri, 9 Jun 2006 17:00:03 -0500
> -----Original Message-----
> From: [email protected] [mailto:owner-
> [email protected]] On Behalf Of Gauri Khanna
> Sent: Friday, June 09, 2006 4:57 AM
> To: [email protected]
> Subject: st: Frontier,stata 8 & stata 9
>
> 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?
>
Have you tried using the difficult option or changing the maximization
algorithm.
Scott
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