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st: Inverse Mills ratio


From   Seema Bhatia <ler02sb@reading.ac.uk>
To   statalist@hsphsun2.harvard.edu
Subject   st: Inverse Mills ratio
Date   Tue, 14 Aug 2007 15:46:15 +0100

Hello there

This is probably a very stupid question but in the STATA help manual,

nshazard(newvar) and mills(newvar) are synonyms; either will create a new 
variable containing the nonselection hazard -- what Heckman (1979) referred 
to as the inverse of the Mills' ratio -- from the selection equation.  The 
nonselection hazard is computed from the estimated parameters of the 
selection equation.

So why would I have to calculate the Inverse Mills ratio instead of just 
using the Mills Lamda value reported with the regression results?

Many Thanks

Seema


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