I suggest you start by searching the SAS website for papers and documentation covering your topic. Your question is way too broad to give meaningful answers.   http://support.sas.com/resources/papers/proceedings13/093-2013.pdf   https://www.sas.com/content/dam/SAS/support/en/sas-global-forum-proceedings/2018/1857-2018.pdf   http://www2.sas.com/proceedings/forum2008/159-2008.pdf     ... View more