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st: Changing -correlate- results


From   "louis boakye-yiadom" <louisby@hotmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: Changing -correlate- results
Date   Mon, 21 Mar 2005 11:48:18 +0000

Dear All,
A -correlate- command in my do file gives slightly different results each time the file is executed. I'm baffled by this, and I don't find any explanation from the -help- for -correlate-. I've provided below, three of such different results, as well as, excerpts of the do file. Any help will be appreciated. Thank you.


. correlate rankf1 rankf2;
(obs=97)

| rankf1 rankf2
-------------+------------------
rankf1 | 1.0000
rankf2 | 0.7524 1.0000


. correlate rankf1 rankf2;
(obs=97)

| rankf1 rankf2
-------------+------------------
rankf1 | 1.0000
rankf2 | 0.7489 1.0000


. correlate rankf1 rankf2;
(obs=97)

| rankf1 rankf2
-------------+------------------
rankf1 | 1.0000
rankf2 | 0.7443 1.0000


use isocomb_indices, clear;
sort f1;
list region district dmrd dmkt dpt djss dchp f1, clean header(50);
gen rankf1=_n;
sort f2;
list region district pwrd pwmkt1 pwmkt2 pwjss pwchp f2, clean header(50);
gen rankf2=_n;
bysort region: list region district nc f1 rankf1 f2 rankf2, clean mean(f1 rankf1 f2 rankf2);
correlate rankf1 rankf2;
drop rankf1 rankf2;
sort region district;
save isocomb_indices, replace;
clear;
log close;
exit;


Louis


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