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st:ttest


From   "Vidya Mahambare" <MahambareV@Cardiff.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st:ttest
Date   Thu, 04 Dec 2003 11:25:39 +0000

Hi All,
I am having some problem using ttest. I have a panel data - 10 time periods,
2000+ firms from 13 sectors and 3 ownership categories.
I am interested in testing whether the means of a variable (efficiency
indicator) are different for the ownership pairs during a particular time period
for each sector.
Eg; time = 1 to 4, ttest efficiency if owner =1 and owner =3 for sector 1, then
sector 2 and so on
Time = 5 to 8, ttest efficiency if owner =1 and owner =3 for sector 1, then
sector 2 and so on

Should I temporality drop observations in all sectors except one and then do
ttest? I have tried several different ways, but without success. 

Any suggestion would be helpful.

thanks

Vidya



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