David Kantor
> Another issue to consider is, do you use Stata 8 or an
> earlier edition? If
> you have Stata 8, then to test canter==. is to seek a
> specific missing
> value: . But there are others: .a, .b, .c, etc.. If you
> want to get all
> missing values, then you should test...
> missing(canter)
> or, equivalently,
> mi(canter)
> or, equivalently,
> canter <.
The last is a typo.
canter < .
is true for non-missings.
canter >= .
is true for missings. While we're on the subject,
note that mi(canter) would catch the case when
canter was a string missing, but canter == . or
canter >= . would then be illegal.
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