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Team, I am trying to resolve the self-selection bias of a sample in an experiment and would like to run the Heckman Correction Estimation using R. Can someone help me with the R-Code... I tried searching for the discussion, but not successful. Thanks in advance, Best, Kishore/.. http://kaykayatisb.blogspot.com [[alternative HTML version deleted]]

...esiduals formed a pattern in the original regression equation. After running the White's test, I got some new standard errors - but from here I didn't understand how to plot the residuals (or) how to correct the estimates?? Can some one direct me in this regard.. Best, Kishore/.. http://kaykayatisb.blogspot.com [[alternative HTML version deleted]]

Hi All, I've been having a little trouble with creating a loop that will run a a series of t.tests for inspection, Below is the code i've tried, and some checks i've looked at. I've used the get(paste()) idea as i was told previously that the use of the eval should try and be avoided. I've run a single syntax to check that my systax is correct and works without any problems