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Please use this identifier to cite or link to this item: http://hdl.handle.net/2451/26263
Title: Accounting for Excess Zeros and Sample Selection in Poisson and Negative Binomial Regression Models
Authors: Greene, William H.
Issue Date: Mar-1994
Series/Report no.: EC-94-10
Abstract: We present several modifications of the Poisson and negative binomial models for count data to accommodate cases in which the number of zeros in the data exceed what would typically be predicted by either model. The excess zeros can masquerade as overdispersion. We present a new test procedure for distinguishing between zero inflation and overdispersion. We also develop a model for sample selection which is analogous to the Heckman style specification for continuous choice models. An application is presented to a data set on consumer loan behavior in which both of these phenomena are clearly present.
URI: http://hdl.handle.net/2451/26263
Appears in Collections:Economics Working Papers

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