Re: st: Confidence Interval for Concentration Index

[Soumitra Ghosh <soumitra@tiss.edu>]

Thank you, Roger for your kind response. Best regards, Soumitra

On 2013-08-22 22:58, Roger B. Newson wrote:
> The way I would calculate a CI for the Gini concentration index is to
> use the -scsomersd- package, which you can download from SSC, and
> which also uses the SSC packages -somersd- and -expgen-. The first
> example in the online help for -scsomersd- gives the calculation of a
> CI for the Gini index, using the Normalizing and variance-stabilizing
> hyperbolic-arctangent (or Fisher's z) transformation, which is
> probably more important when estimating high Gini coefficients (like
> in Latin America) than when estimating low Gini coefficients (like in
> the -womenwage- dataset used in the example).
>
> Another possibility, whihc I think was proposed by Stephen Jenkins,
> is to use percentile bootstrapping (using -bootstrap-) with the
> -ineqdeco- package, which you can also download from SSC. This method
> will be a bit more computer-intensive than mine, but will find the
> Normalizing and variance-stabilizing transformation in the data,
> instead of automatically assuming the hyperbolic arctangent.
>
> I hope this helps.
>
> Best wishes
>
> Roger
>
> Roger B Newson BSc MSc DPhil
> Lecturer in Medical Statistics
> Respiratory Epidemiology and Public Health Group
> National Heart and Lung Institute
> Imperial College London
> Royal Brompton Campus
> Room 33, Emmanuel Kaye Building
> 1B Manresa Road
> London SW3 6LR
> UNITED KINGDOM
> Tel: +44 (0)20 7352 8121 ext 3381
> Fax: +44 (0)20 7351 8322
> Email: r.newson@imperial.ac.uk
> Web page: http://www.imperial.ac.uk/nhli/r.newson/
> Departmental Web page:
>
> http://www1.imperial.ac.uk/medicine/about/divisions/nhli/respiration/popgenetics/reph/
>
> Opinions expressed are those of the author, not of the institution.
>
> On 22/08/2013 17:59, Chamara Anuranga wrote:
> > you can use the regression method. It gives the robust standard 
> > error.
> > Refer to world bank health equity book
> >
> >
> > http://web.worldbank.org/WBSITE/EXTERNAL/TOPICS/EXTHEALTHNUTRITIONANDPOPULATION/EXTPAH/0,,contentMDK:20216933~menuPK:400482~pagePK:148956~piPK:216618~theSitePK:400476,00.html
> >
> > this book has code for standard error.
> >
> > Thanks,
> > Chamara
> >
> > On Thu, Aug 22, 2013 at 8:46 PM, Soumitra Ghosh <soumitra@tiss.edu> 
> > wrote:
> > > Hello Nick,
> > >
> > > Apologies for the inconvenience caused by the previous message. I 
> > > shall be
> > > highly obliged if any of the stata users can help me, addressing 
> > > the issue
> > > mentioned in my previous mail.
> > >
> > > Thanks.
> > > SG
> > >
> > > On 2013-08-22 20:27, Nick Cox wrote:
> > > > I'd advise that requests for urgent responses really are
> > > > counter-productive. It is difficult to imagine any committed Stata
> > > > person being more willing to answer this just because it's urgent 
> > > > for
> > > > you, and easy to imagine many being irritated into deleting it
> > > > instantly.
> > > >
> > > > The point is made in the Statalist FAQ, which you were asked to 
> > > > read
> > > > before posting.
> > > > Nick
> > > > njcoxstata@gmail.com
> > > >
> > > >
> > > > On 22 August 2013 15:52, Soumitra Ghosh <soumitra@tiss.edu> wrote:
> > > > > Hi,
> > > > >
> > > > > I have used the following commands to estimate the concentration 
> > > > > index.
> > > > > glcurve income [aw=weight], pvar(rank) nograph
> > > > > qui sum yis [fw=intweight]
> > > > > scalar mean=r(mean)
> > > > > cor yis rank [fw=intweight], c
> > > > > sca c=(2/mean)*r(cov_12)
> > > > > sca list c
> > > > >
> > > > > Kindly let me know how to derive confidence interval for the
> > > > > concentration
> > > > > index calculated using the above STATA commands.
> > > > >
> > > > >
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