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st: Different results with the same code


From   Estrella Gomez <[email protected]>
To   [email protected]
Subject   st: Different results with the same code
Date   Mon, 10 Feb 2014 10:07:58 +0100

Dear Statalisters

I am running a code and I have realized that every time I run it the
results (the coefficients and the standard errors) are different. This
is the code:

clear all
use "itunes_grav_song", clear
sort id country orig

egen  nb_id=tag(id)
bysort orig: egen nr_orig=sum(nb_id)
bysort orig country: egen nr_dest=sum(available)
gen avail_share=(nr_dest/nr_orig)
collapse (count) nr_songs=id (firstnm) contig comlang ldist
avail_share, by(country orig)
encode country, gen(d_id)
encode orig, gen(o_id)
gen home=country==orig

reg avail_share ldist comlang home i.d_id i.o_id


I have checked and after the collapse I obtain every time the same
dataset, so I don't know what can be the reason

Thanks for any help!
Estrella
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