# st: Re: Concentration Curve and Index

 From "R.E. De Hoyos" To Subject st: Re: Concentration Curve and Index Date Mon, 5 Sep 2005 15:54:16 +0100

Tina,

See:

ssc install glcurve

ssc install geivars

-geivars- will get the sampling variance of the GE and Atkinson inequality indexes. You can also get empirical standard errors of your Gini indexes by using bootstrapping methods. (help -bootstrap-)

Hope this helps,

Rafa
________________________
R.E. De Hoyos
Faculty of Economics
University of Cambridge
CB3 9DE, UK
www.econ.cam.ac.uk/phd/red29/

----- Original Message ----- From: "TinnaLaufey Asgeirsdottir" <statalist@gmail.com>
To: <statalist@hsphsun2.harvard.edu>
Sent: Monday, September 05, 2005 3:36 PM
Subject: st: Concentration Curve and Index

```Hello Statalist

I am looking at income inequalities in health and using the
concentration curve and concentration index (based on the Gini and the
Lorenz curve).

I managed to draw a graph and calculated the index number. However I
know there must be a better way then mine since I do not get any
standard deviations or confidence intervals my way... others are
reporting those.

(The way I did it was just by sorting by income, and adding % of total
population health cumulatively, starting from the least advantaged
individual based on family income. Then I drew a curve based on this
information. The index number is supposed to be twice the area between
the line of equality and the concentration curve.  For the Index I
simply calculated the difference between the curve i calculated and
the line of equality and doubled that number.  Basically, I just
worked my way to the answer through the theory behind the curve and
the index.)

I haven't found one paper that describes how this was calculated,
which means it is probably so easy that it should be obvious. I have
looked all over older statalist mails and the Internet and am still in
the dark. Is there a regression involved that I do not know about? Do
any of you know it?

Thank you
Tina

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