Re: st: warning: overlapping samples

[ncdcta00@uniroma2.it]

Thanks Ben, just others few questions:
Can I consider the correction with Heckman? is it the same to make the  
 bootstrap?Is there a routine with bootstrap for oaxaca?
and What's I do with the promblem about overlapping ?
thank you very much.
Best,


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


> You can use -oaxaca- in this case, but the standard errors will be
> biased because the sample of females and males are not independent.
> Use the bootstrap to compute the standard errors.
> ben
>
> On 6/28/07, ncdcta00@uniroma2.it <ncdcta00@uniroma2.it> wrote:
> > Thanks Ben, I don't know why? because I want calculate the
> > decoposition between husband and wife, so sure I have relation because
> >  my dataset is:
> > wife   husband  wwage hwage
> > 1       1          100  200
> > I do :
> > reg wwage xi
> > est stor w
> > reghwage xi
> > est sto h
> > oaxaca h w
> >
> >
> > Can I estimate with oaxaca this data set? is it right the procedure?
> > thanks a lot for your help.
> >
> >
> >
> > Quoting Ben Jann <ben.jann@gmail.com>:
> >
> > > It means that some of your females are in the male sample or vice
> > > versa. Check the -if- qualifiers of your regression commands.
> > > ben
> > >
> > > On 6/28/07, ncdcta00@uniroma2.it <ncdcta00@uniroma2.it> wrote:
> > > > Dear statalist, I'm doing a oaxaca decomposition and I have this
> > > > message before the estmation with oaxaca. What is it means?
> > > > thanks
> > > > warning: overlapping samples
> > > > (high estimates: female4; low estimates: male4)
> > > >
> > > >                                                  Mean prediction 1
> > > > =  2.095566
> > > >                                                  Mean prediction 2
> > > > =  1.939635
> > ------------------------------------------------------------------------------
> > > >              |      Coef.   Std. Err.      z    P>|z|     [95%
> > > > Conf. Interval]
> > -------------+----------------------------------------------------------------
> > > >   difference |    .155931   .0301257     5.18   0.000     .0968858
> > > >    .2149762
> > ------------------------------------------------------------------------------
> > > > Linear decomposition
> > ------------------------------------------------------------------------------
> > > >        Total |      Coef.   Std. Err.      z    P>|z|     [95%
> > > > Conf. Interval]
> > -------------+----------------------------------------------------------------
> > > > three-fold   |
> > > >   endowments |  -.6220027   .2610409    -2.38   0.017    -1.133633
> > > >    -.110372
> > > > coefficients |  -.1470742   .0839665    -1.75   0.080    -.3116456
> > > >    .0174971
> > > >  interaction |   .9250079   .2727451     3.39   0.001     .3904373
> > > >    1.459579
> > ------------------------------------------------------------------------------
> > > > *
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