Homepage of Jeroen Smits
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Downloadable papers on selection bias and the Heckman two-step procedure, including instructions on how to perform this procedure with SPSS
Selectiebias en zelfselectie in sociaal-wetenschappelijk onderzoek (PDF file in Dutch)
Estimating the Heckman two-step procedure to control for selection bias with SPSS (Word document)
SPSS instructions for Heckman
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(Page updated at 13-07-2008)