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st: different result each time


From   "Rajesh Tharyan" <R.Tharyan@exeter.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: different result each time
Date   Thu, 25 Sep 2008 00:52:22 +0100

Hi all,

I am using the following code to do a bunch of t-tests and output the
results to excel

foreach i in 1 2 3 5 7 9 {
ttest winar`i' if type=="C", by(class)
scalar m1`i'=`r(mu_1)'
scalar m2`i'=`r(mu_2)'
scalar mdiff`i'=(`r(mu_1)'-`r(mu_2)')
scalar t`i'=r(t)
scalar p`i'=r(p)
}
matrix C =
(m11,m12,m13,m15,m17,m19\m21,m22,m23,m25,m27,m29\mdiff1,mdiff2,mdiff3,mdiff5
,mdiff7,mdiff9\t1,t2,t3,t5,t7,t9\p1,p2,p3,p5,p7,p9)
matrix rownames C= PB PS PB-PS t-stats p-val
matrix colnames C= (per1) (per2) (per3) (per4) (per5) (per6)
mat li C
xml_tab C,append
clear all

Each time I run this I get different results. See below ( only the first row
of matrix is shown)

Run1
PB	0.234  	0.109 	0.027	   -0.020     0.006	0.186

Run2.
PB   .22601096   .10431468   .02967896  -.00025647   .02184916   .21296798

And so on. Why? Any thoughts

Regards
rajesh

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