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RE: st: selecting variables by their format
An observation in Stata is one row of your dataset,
otherwise known as a case or record.
A string is empty if it contains no
characters and so is represented by "".
Thus if I read in the auto dataset
and ask for a listing
. l if rep78 == 6
I will get no result as there are
no such observations. This is
different from having some observations
which for a string variable just
contain an empty string "".
It's the difference between having no
boxes and some boxes that happen to
> I'm not sufficiently familiar with stata-specific language,
> "No observations" is here non-Stata language
> for "all missing", meaning all empty strings.
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