I didn't worry too much about the guesses; I just gave optim all
zeros and it worked fine. When I read your question, I tried a few
more guesses, and the answers optim gave did not seem very sensitive
to my guesses. Are certain guesses giving you weird looking answers?
On Mar 16, 2008, at 1:40 PM, Jon Bischof wrote:
Hi all,
I'm having trouble figuring out how a log-like function maximizing
over multiple parameters would work. It seems for the "par" we would
have to feed the function vectors of guesses for each of the three
betas in the X matrix. How do we choose what to feed into this thing?
It seems difficult to come up with guesses a priori (and unlike a
probability they don't have an obvious range like [0,1])
Thanks,
--
Jon Bischof
Graduate Student
Department of Government
Harvard University
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