[R] Please help me

From: Xiongqing Zhang <xqzhang85_at_yahoo.com>
Date: Tue, 08 Jun 2010 00:42:38 -0700 (PDT)

Dear Mr. or Ms.,
 

I used the R-software to run the zero-inflatoin negative binomial model (zeroinfl()) .
 

Firstly, I introduced one dummy variable to the model as an independent variable, and I got the estimators of parameters. But the results are not satisfied to me. So I introduced three dummy variables to the model. but I could not get the results. And the error message is "solve.default(as.matrix(fit$gaussian)) ". I do not know the reasons fully. And I want to know what method was used to estimate the parameters when I called the function zeroinfl() .
 

I will be very appreciate if you can help me. Thank you.
 

Best regards,
 

Sincerely,
Xiongqing Zhang

      
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