Thanks for looking at it and sorry I wasn't more specific in how I'm pulling my data. I'm pulling from our server (EDW), and Volume is technically one field. Then I'm doing a condition to get Volume for 2012 and Volume for 2013. This is where I'm having trouble in that the below formula doesn't work, and I'm guessing it's because the Volume columns have conditions and Tableau doesn't like this...
IF FIRST()==0 THEN
WINDOW_SUM(sum(IF ([Volume2013]>20 and [Volume2012]<100) THEN 1 ELSE 0 END))