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Cummings, Tammy H.; Hardin, James W.; McLain, Alexander C.; Hussey, James R.; Bennett, Kevin J.; Wingood, Gina M.
The Stata journal, 06/2015, Volume: 15, Issue: 2Journal Article
We present motivation and new commands for modeling heaped count data. These data may appear when subjects report counts that are rounded or favor multiples (digit preference) of a certain outcome, such as the number of cigarettes reported. The new commands for fitting count regression models (Poisson, generalized Poisson, negative binomial) are also accompanied by real-world examples comparing the heaped regression model with the usual regression model as well as the heaped zero-inflated model with the usual zero-inflated model.
