The PRINCOMP Procedure
FREQ Statement
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FREQ variable;
The FREQ statement specifies a variable that provides frequencies for each observation in the DATA= data set. Specifically, if n is the value of the FREQ variable for a given observation, then that observation is used n times.
The analysis that you produce by using a FREQ statement reflects the expanded number of observations. The total number of
observations is considered to be equal to the sum of the FREQ variable. You could produce the same analysis (without the FREQ
statement) by first creating a new data set that contains the expanded number of observations. For example, if the value of
the FREQ variable is 5 for the first observation, the first five observations in the new data set are identical. Each observation
in the old data set would be replicated 
times in the new data set, where is the value of the FREQ variable for that observation.
If the value of the FREQ variable is missing or is less than 1, the observation is not used in the analysis. If the value is not an integer, only the integer portion is used.