FREQ variable;
The variable in the FREQ statement identifies a numeric variable in the data set that contains the frequency of occurrence of each observation. PROC GAMPL treats each observation as if it appeared f times, where the frequency value f is the value of the FREQ variable for the observation. If f is not an integer, then f is truncated to an integer. If f is less than 1 or missing, the observation is not used in the analysis. When you do not specify the FREQ statement, each observation is assigned a frequency of 1.