Re: st: Oaxaca and heckmanan

[ncdcta00@uniroma2.it]

Thanks a lot Ben.


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

> Okay, things are different if you use -oaxaca-, since other than
> -decompose- it does not report the selection effect. You should be
> able to obtain it by running -oaxaca- twice and comparing the results.
> Type
>
> oaxaca male female
> local raw = r(diff)
> oaxaca male female, adjust(lambda1)
> di "Difference due to selection = " `raw' - r(diff)
>
> If you don't want to see the first output change the first line to
>
> quietly oaxaca male female
>
> ben
>
>
>
> On 10/1/07, ncdcta00@uniroma2.it <ncdcta00@uniroma2.it> wrote:
> > 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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