
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


      
	[[alternative HTML version deleted]]

