dear all,
when I use the following command:
drop if x>450
STATA drops a lot of observations, while when I exclude missing values as
follows:
drop if x>450 & x!=.
STATA eliminates just a couple of observations
I realized this when I run a regression including x as regressor. If STATA
drops missing data with the first command, shouldn't drop the same
observations when I run the regression after using the second command?
why doesn't it happen?
thanks in advance
Mariarosaria
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