Need help on comparing variables accross t-tests

[Natalie Leclerc]

I need help conducting t-tests with variables that have 2 things inside of them. For example, If I try to do ttest three_conditions by(south) there are multiple variables coded in one.

[Øyvind Snilsberg]

maybe -regress- and -testparm- is what you want, e.g.,

sysuse auto, clear
regress foreign i.rep78
testparm i.rep78, equal

[Natalie Leclerc]

That did not work