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st: RE: different result everytime - something strange


From   philippe van kerm <philippe.vankerm@ceps.lu>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   st: RE: different result everytime - something strange
Date   Fri, 20 Jun 2008 09:11:05 +0200

Shehzad,

Just to be sure: Are you using an up-to-date version of -glcurve- (from the SSC archive)?

. which glcurve
*! 3.2.0 Philippe Van Kerm - Stephen P. Jenkins 07 February 2007

Philippe


-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Shehzad Ali
Sent: Thursday, June 19, 2008 7:02 PM
To: statalist@hsphsun2.harvard.edu
Subject: st: different result everytime - something strange

Hi listers,

I have encountered a funny problem, which maybe due to something wrong with
my codes or with stata. I am trying to calculate concentration index using
convenient regression method but everytime I run my do file, I get
different results using exactly the same data. I am sure someone can help.

Here is what I am doing:

glcurve y [aw=weight], pvar(rank) replace nograph
qui sum x [fw=weight]
scalar mean=r(mean)
qui sum rank [fw=weight]
sca var_rank=r(Var)
gen lhs=2*var_rank*(x/mean)
regr lhs rank [pw=weight], cluster(commune)
sca CI=_b[rank]
display "concentration index", CI

Any help would be appreciated.

Shehzad

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