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
[email protected]
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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