The LIFETEST Procedure
FREQ variable </ option> ;
The FREQ statement identifies a variable that contains the frequency of occurrence of each observation. PROC LIFETEST treats each observation as if it appeared n times, where n is the value of the FREQ variable for the observation. The FREQ statement is useful for producing life tables when the data are already in the form of a summary data set. If it is not an integer, it is truncated to an integer unless the NOTRUNCATE option is specified. If it is missing or less than or equal zero, the observation is not used.
The following option can be specified in the FREQ statement after a slash (/):