How do I handle datasets with an excess number of zero counts?

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Réponse

For data with an excess of zeros, you can use a zero-inflated model by setting the 'modeltype' parameter to 'ZIP', 'ZINB', or 'ZICMPOISSON'. You must also specify the regressors for the zero-inflation component of the model using the 'zeromodel' parameter. The link function for this part can be set to 'LOGISTIC' (the default) or 'NORMAL'.
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countregFitModel

countreg

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Other questions about countregFitModel
Can this action perform Bayesian analysis? What model selection methods are available in the countregFitModel action? How can I save the fitted model for future use, such as scoring? How can I obtain predicted values or other statistics for each observation? What types of count data models can be fitted with this action?
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