Hello folks,

I am trying to estimate the two-step Heckman regression model.  I would like to make an adjustment for intragroup correlations.  Stata can implement this with the "cluster" option, but I am really hoping to stick with R.  It seems that the micEcon package is the primary source for this two-step regression model (i.e., heckit), but I can't find a way to make the adjustment.  Am I overlooking something with this package or other packages?

Brian 

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