ECONOMETRICS LECTURE: HECKMAN’s SAMPLE SELECTION …
where α is a constant, φ denotes the standard normal density function, and Φ denotes the standard normal cumulative distribution function. The term in red denotes the Inverse Mill’s ratio. Compare (9) with (8). E[(εi| ui > - Ziγ)] = ρεuσε λi(-Ziγ) = βλ λi(-Ziγ) (8) ................
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