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st: resticting the sample?
I want to restrict my sample first and then use the
resticted sample in my regressions. Is there a compact
way to do this.
for example, I want to run regression on age<40. but I
don't want to add "if age<40" for every regressions I
do, as it would be too long ( I have a bunch of other
stuffs). is there an alternative way to do this?
Thanks a lot in advance.
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