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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