Another Look at the Identification at Infinity of Sample Selection Models

Xavier D'Haultfoeuille and Arnaud Maurel ()

No 4334, IZA Discussion Papers from Institute for the Study of Labor (IZA)

Abstract: It is often believed that without instrument, endogenous sample selection models are identified only if a covariate with a large support is available (see Chamberlain, 1986, and Lewbel, 2007). We propose a new identification strategy mainly based on the condition that the selection variable becomes independent of the covariates when the outcome, not one of the covariates, tends to infinity. No large support on the covariates is required. Moreover, we prove that this condition is testable. We finally show that our strategy can also be applied to the identification of generalized Roy models.

Keywords: identification at infinity; sample selection model; Roy model (search for similar items in EconPapers)
JEL-codes: C21 (search for similar items in EconPapers)
New Economics Papers: this item is included in nep-ecm
Date: 2009-07
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