The FREQ statement names a numeric variable that provides a frequency for each observation in the input data set. If you use a FREQ statement, PROC NPAR1WAY assumes that an observation occurs times, where 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.
If the value of the FREQ variable is missing or is less than one, PROC NPAR1WAY does not use that observation in the analysis. If the value of the FREQ variable is not an integer, PROC NPAR1WAY uses only the integer portion as the frequency of the observation.