The FREQ statement names a numeric variable that represents a frequency of occurrence for each observation in the input data set. PROC NPAR1WAY treats the data set as if each observation appears n times, where n is the value of the FREQ variable for the observation. The sum of the FREQ variable values represents the total number of observations, and the analysis is based on this expanded number of observations.

Noninteger values of the FREQ variable are truncated to the largest integer less than the FREQ value. The observation is used in the analysis only if the value of the FREQ variable is greater than or equal to 1.