We present a correction for sample selectivity in the Poisson regression model for count data. The model is similar to that devised by Heckman for the linear regression model. Estimation by a two step method is suggested using nonlinear least squares at the second step. The model described here was presented in Greene (1994). Terza (1995) describes an alternative approach that has a more orthodox specification of the regression function. We show in this note that Terza's approach is essentially the same as Greene's.
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Paper provided by New York University, Leonard N. Stern School of Business, Department of Economics in its series Working Papers with number
95-06.
Length: Date of creation: May 1995 Date of revision: Handle: RePEc:ste:nystbu:95-06
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