select test control BEFORE the experiment

[tsai1108_gmail_com]

Hi SAS community, 

I know how to do matching if there is already a test group set up. 

But if we are trying to select test/control group before the intervention happens, what code do I use? the idea is to select comparable 1:1 cohorts and randomize one to test and one to control. The variables we are trying to control for are demographic, access to internet, and previous received marketing volumes, etc. 

Is there any paper on this where I can read on? or any existing codes?

Thanks so much for your help!

SAS user

[ChrisNZ]

I am unsure many people understood what you are after.