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Mar 13, 2023 at 20:32 comment added José Gabriel Astaíza-Gómez That issue is covered in Heckman and Navarro (2004).
Mar 29, 2021 at 1:09 comment added Durden Estimating a Heckman model without a variable excluded from the second stage, and thereby relying only on the non-linearity of the correction term, might work in theory, but generally leads to unstable estimates, see Stolzenberg & Relles (1997).
Aug 19, 2019 at 21:05 review Late answers
Aug 19, 2019 at 21:36
Aug 19, 2019 at 20:50 review First posts
Aug 20, 2019 at 1:35
Aug 19, 2019 at 20:46 history answered José Gabriel Astaíza-Gómez CC BY-SA 4.0