Well, thanks for your quick response.
In fact, I have another question.
There is a function in Splus, "nlminb". I want to do the same things
in R. According to help, nlminb function uses a quasi-Newton
method and this minimization is subject to box constraint. So, in
this sense I tried to use "BFGS" and "L-BFGS-B". But in both cases,
I couldn't get same result. I'm not sure which method coincide with
that of Splus or at least more similar.
Any suggestions would be very welcome.
+++++++++++++++++++++++++++++++++++++++++++++++++++++
Changku Kang
National Center for Environmental Assessment
EPA (B211F)
919-541-1396
919-541-0245 (fax)
[EMAIL PROTECTED]
Graduate Student
Department of Statistics, NCSU
[EMAIL PROTECTED]
919-513-2956
+++++++++++++++++++++++++++++++++++++++++++++++++++++
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