Hi,

     Is there available package on the optimization function using
Newton-Raphson method (iterative quadratic approximation)? I have been using
the 'optim' function in R and found it really unstable (it depends heavily
on the initial values and functional forms). If I have to code it by myself,
can I get some advice on how to start (any good reference or sample code)? I
really appreciate any help.

thanks,

Michael

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