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Kleiber, Christian
Zeileis, Achim
Year of Publication: 
Series/Report no.: 
WWZ Discussion Paper 2014/13
The rootogram is a graphical tool associated with the work of J. W. Tukey that was originally used for assessing goodness of t of univariate distributions. Here we show that rootograms are also useful for diagnosing and treating issues such as overdispersion and/or excess zeros in regression models for count data. We also introduce a weighted version of the rootogram that can be applied out of sample or to (weighted) subsets of the data, e.g., in nite mixture models. Two empirical illustrations are included, one from ethology, the other from public health. The former employs a negative binomial hurdle regression, the latter a two-component nite mixture of negative binomial models. A further illustration involving underdispersion and an R implementation of our tools are available in the R package countreg.
goodness of fit
count data
Poisson regression
negative binomial regression
hurdle model
finite mixture
Document Type: 
Working Paper

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