The Base SAS procedures use a standardized set of keywords to refer to statistics. You
specify these keywords in SAS statements to request the statistics to be displayed or
stored in an output data set.
In the following notation, summation is over observations that contain nonmissing
values of the analyzed variable and, except where shown, over nonmissing weights and
frequencies of one or more:
x
i
is the nonmissing value of the analyzed variable for observation i.
f
i
is the frequency that is associated with
x
i
if you use a FREQ statement. If you omit
the FREQ statement, then
f
i
=1 for all i.
w
i
is the weight that ...
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