Re: st: Oaxaca and heckmanan

[ncdcta00@uniroma2.it]

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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