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st: different result everytime - something strange


From   Shehzad Ali <sia500@york.ac.uk>
To   statalist@hsphsun2.harvard.edu
Subject   st: different result everytime - something strange
Date   19 Jun 2008 18:02:24 +0100

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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