FREQ variable </ option>;
The FREQ statement identifies the variable (in the input data set) that contains the frequency of occurrence of each observation. PROC ICPHREG treats each observation as if it appears n times, where n is the value of the FREQ variable for the observation. If the frequency value is not an integer, it is truncated to an integer. If the frequency value is missing, the observation is not used in the estimation of the regression coefficients.
You can specify the following option after a slash (/):