Hi All,

          I am really excited about the CEM and want to use it for a lot of future studies. I have two questions:

          1. Which software performs the fastest comparing R, STATA and SAS macro?

          2. I want to get a matched id so that I know which pair (case and control 1to 1 match) are matched together? Is it possible to obtain a data set has that column in the SAS macro or STATA? 

      

          Thanks a lot!

Fang