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Kevin E. Staub, A CAUSAL INTERPRETATION OF EXTENSIVE AND INTENSIVE MARGIN EFFECTS IN GENERALIZED TOBIT MODELS, The Review of Economics and Statistics, Vol. 96, No. 2 (May 2014), pp. 371-375 ...
In this paper we present a specification test for the Tobit model. Specifically, we test the Tobit model against the alternative of a two-part model in which one set of parameters determines the ...