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st: RE: adjust after heckman


From   "Scott Merryman" <smerryman@kc.rr.com>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: adjust after heckman
Date   Fri, 7 Apr 2006 10:53:31 -0500

Unfortunately, -adjust- does not have predict option, but you can
-preserve-, -replace-, and -predict, ycond-.

The following generates the conditional expectation for 5 values of mpg with
the other variables at their means.

sysuse auto
preserve
qui heckman price mpg weight length , select(fore =  trunk )
foreach v of varlist weight trunk length {
	sum `v', meanonly
	replace `v' = r(mean)
	}
forv i = 10(10)50 {
	replace mpg = `i'
	predict ycond_`i', ycond
}
tabstat ycond*, stat(mean) 
restore


Scott



> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-
> statalist@hsphsun2.harvard.edu] On Behalf Of Christer Thrane
> Sent: Friday, April 07, 2006 9:22 AM
> To: statalist@hsphsun2.harvard.edu
> Subject: st: adjust after heckman
> 
> Hi,
> 
> Normally I use adjust (after -regress-) to predict the mean earnings for
> variuos combinations of my indeps.
> When doing this for -heckman- I suspect that adjust produces the
> prediction
> for the "latent" mean earnings
> (ie regardless of if a person actually is employed or not). However, I
> want
> to get the mean earnings for the
> variuos combinations of my indeps, condtitional on being employed (ie
> being
> observed).
> 
> How do I do this?
> 
> Best regards,
> 
> Christer Thrane



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