st: Pseudo R-squared in ZIP negbin model

["Joshua P. Mersky" <MERSKY@Waisman.Wisc.Edu>]

Greetings,

I am conducting analyses using zero-inflated negative binomial regression. 
Unlike regular negbin output, ZIP models do not produce a Pseudo R-Squared 
statistic.  I would like to know if there is a Stata command whereby I can 
produce a Pseudo R-squared statistic, or its equivalent, to determine model 
fit in a ZIP model.

Many thanks,

Josh

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