Area under the curve calculation

[ptadger]

Hi...I'm also dealing with the same questions..

So I'll post to ussufull approaches:

1) In SAS/STAT, use data statement: 
https://www.lexjansen.com/wuss/2004/posters/c_post_the_sas_calculations_.pdf

2) In SAS/ETS, use PROC EXPAND  https://support.sas.com/kb/24/990.html