Echoing an older inquiry
(https://stat.ethz.ch/pipermail/r-help/2008-November/180184.html), does anyone
know of R code that exists to correct for sample selection with panel data as
in:
J.M. Wooldridge (1995), Selection Corrections for Panel Data Models Under
Conditional Mean Independence Assumptions, Journal of Econometrics 68, 115-132.
Thank you,
Jen
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