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st: RE: different result everytime - something strange


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: different result everytime - something strange
Date   Thu, 19 Jun 2008 18:10:46 +0100

The most common explanation is that something is changing the sort order
of your data. 

I'd check to see whether it is -glcurve-. 

Is this _all_ of what you are doing? 

Nick 
n.j.cox@durham.ac.uk 

Shehzad Ali

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


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