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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