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, [email protected] <[email protected]> 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 <[email protected]>:
>
> > Can you show me a copy of your commands and output?
> > ben
> >
> > On 10/1/07, [email protected] <[email protected]> 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 <[email protected]>:
> >>
> >> > 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, [email protected] <[email protected]> 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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