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: ----------------------------------------------------------------------------------------------------------------------------------       > 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 âNelder-Meadâ, âBFGSâ, âCGâ, âL-BFGS-Bâ, âSANNâ -----------------------------------------------------------------------------------------------------------------------------------
      So, what is the solution (R syntax) to get estimation by Newton Raphson?       Thanks             Regards,       Krist. [[alternative HTML version deleted]]
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