@Nusseey,   It may be too late, but I wanted to let you know that the new release of SAS/STAT 15.1 includes new RMST functionality for survival analysis.    There is a new RMSTREG procedure that analyzes time-to-event data by using regression with respect to the RMST.  Also, the LIFETEST procedure was enhanced with the ability to analyze and plot RMST and restricted mean time lost (RMTL).   Hopefully this is helpful!   -Brian ... View more