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Re: st: Oaxaca and heckmanan


From   ncdcta00@uniroma2.it
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Oaxaca and heckmanan
Date   Mon, 01 Oct 2007 22:01:14 +0200

Dear Ben,
The commands are:
probit active age age2 eduf1 eduf2 chl12 ch06f ch03f logincome if country==1
predict xb if e(sample), xb
gen lambda1=normden(xb)/norm(xb)

regress logwage eduf1 eduf2 experience exp2 occ1 occ2 occ3 occ4 occ5 occ7 occ8 occ9
sizemed sizelarge ten ten2 if wave==8 & hourwork>8 & country==1 & male==1
estimates store male

regress logwage lambda1 eduf1 eduf2 experience exp2 occ1 occ2 occ3 occ4 occ5 occ7 occ8
occ9 sizemed sizelarge ten ten2 if wave==8 & hourwork>8 & country==1 & female==1
estimates store female
oaxaca male female, adjust(lambda1)

results
. oaxaca male female, adjust(lambda1)
(high estimates: male; low estimates: female)

Mean prediction 1 = 2.36937
Mean prediction 2 = 2.041417

Coef. Std. Err. z P>z [95% Conf. Interval]

difference .3279525 .0415594 7.89 0.000 .2464976 .4094073


Linear decomposition

Total Coef. Std. Err. z P>z [95% Conf. Interval]

three-fold
endowments .1708579 .0461812 3.70 0.000 .0803443 .2613714
coefficients -5.682699 2.166054 -2.62 0.009 -9.928087 -1.437311
interaction 5.839793 2.166142 2.70 0.007 1.594234 10.08535

Thanks for your help.
Best,
Catia




Quoting Ben Jann <ben.jann@gmail.com>:


Can you show me a copy of your commands and output?
ben

On 10/1/07, ncdcta00@uniroma2.it <ncdcta00@uniroma2.it> wrote:
Thanks a lot Ben for your help.
I try to use oaxaca but in the output I don't see the selection effect, I use
oaxaca male female, adjust(lambda).
Thanks again.
Best,



Quoting Ben Jann <ben.jann@gmail.com>:

> The effect of selection is the remainder, i.e. the difference between
> the raw differential and the selection adjusted differential. It is
> reported at the end of -decompose-'s output ("... differential due to
> selection variable ...").
>
> Also have a look at the -oaxaca- command, available from the SSC
> Archive (type -ssc install oaxaca-), which is a successor of
> -decompose-.
>
> ben
>
> On 9/30/07, ncdcta00@uniroma2.it <ncdcta00@uniroma2.it> wrote:
>> Dear Statalist,
>> I try to do an estimation with oaxaca and heckman and I want to
>> separate the effects of selection, endowment and remuneration.
>> I use the command decompose, lambda(lbda) but this command return me
>> only two effects: endowment and remuration.
>> How I can separate the other effect (selection)?
>> I will appreciate any help to solve this problem.
>> Thanks in advance
>> Best,
>> Catia.
>>
>>
>>
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