TABULATE Procedure
FREQ Statement
Specifies a numeric variable that contains the frequency
of each observation.
Tip: 
The effects of the FREQ and WEIGHT statements are similar
except when calculating degrees of freedom.

See: 
FREQ 
Syntax
Required Argument
 variable

specifies a numeric
variable whose value represents the frequency of the observation.
If you use the FREQ statement, then the procedure assumes that each
observation represents n observations,
where n is the value of variable.
If n is not an integer, then
SAS truncates it. If n is less
than 1 or is missing, then the procedure does not use that observation
to calculate statistics.
The sum of the frequency
variable represents the total number of observations.
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