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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