Dear Mr.Zeileis & all.

(1)     Thx for your reply. Yes, I am talk about the function zeroinfl() from the package "pscl". I want to use Newton Raphson to get parameter             estimation ZINB, so I try this:
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        > zinb <- zeroinfl(y ~x1+x2+x3+x4+x5|x1+x2+x3+x4+x5, data = dat, link="logit",dist = "negbin", method="Newton Raphson") 
Error in match.arg(method) : 
          'arg' should be one of “Nelder-Mead”, “BFGS”, “CG”, “L-BFGS-B”, “SANN”
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        So, what is the solution (R syntax) to get estimation by Newton Raphson?
        Thanks
        
        Regards,
        Krist.


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