[R] problem in using optim
rvaradhan at jhmi.edu
Fri May 7 15:12:21 CEST 2010
It probably means that your parameters are taking on values that are
infeasible. You may have to impose constraints on your parameters to get a
solution (e.g. bounds constraints). If you need better help, you have to
send us a minimal, self-contained, reproducible example.
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On
Behalf Of Carol Gao
Sent: Friday, May 07, 2010 5:53 AM
To: R-help at r-project.org
Subject: [R] problem in using optim
Dear R users,
When I was trying to use the function *optim* to get the MLEs, quite a few
warning messages showed up as below:
Warning in log(psi * lam) : NaNs produced
I am just wondering what does this mean? Was it something wrong with my
likelihood function or was it sth wrong with the data?
Thanks in advance.
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