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w_idt
2008 Oct 30
0
a nlm() question
Dear R listers,
I have a very annoying problem using nlm().
I want to find the minimizer of my target function, if written in
\LaTeX is
f(\mu1,\mu2,\sigma1,\sigma2) = \sum_i^n( w_ig_t(z_i) ), where
g_t(z) is a pdf of bivariate normal distribution and z_i is my samples.
I cannot get the estimation result generated by nlm(), and I got
the following errors
"
Error in nlm(foo, theta.start, hessian = TRUE) :
non-finite value supplied by 'nlm'
"
f...