Displaying 1 result from an estimated 1 matches for "zinbi".
Did you mean:
zinb
2010 Jun 02
1
Problems using gamlss to model zero-inflated and overdispersed count data: "the global deviance is increasing"
...st, I create a (strong) pattern in the dataset by:
data$LFAP200 <- data$LFAP200 + (data$duck*data$duck)
I try to analyze these data by fitting several possible distributions (Poisson PO, zero-inflated Poisson ZIP, negative binomial type I and type II NBI NBII and zero-inflated negative binomial ZINBI) while using cubic splines with a df=3. The best fitting model will then be choses on the basis of its AIC.
However, these models frequently fail to converge, and I am not sure why, and what to do about it. For example:
> model_Poisson <- gamlss(duck ~ cs(HHCDI200,df=3) + cs(HHCDI1000,df=3)...