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From | Soumitra Ghosh <soumitra@tiss.edu> |
To | <statalist@hsphsun2.harvard.edu> |
Subject | Re: st: Confidence Interval for Concentration Index |
Date | Fri, 23 Aug 2013 06:47:29 +0530 |
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, ChamaraOn 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 issuementioned 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 Stataperson being more willing to answer this just because it's urgent foryou, and easy to imagine many being irritated into deleting it instantly.The point is made in the Statalist FAQ, which you were asked to readbefore 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. * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/* * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/* * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/* * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/* * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/
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