Hello All ,   I am new to SAS Time Series . My Objective is to find top selling period in intervals ( 12 weeks ) by item in a given period . I would like to know if we have any SAS Procedures to help .   Appreciate any help .   Ex : I have item, year , week , date , Units_sold ( 2 years of data 2017 - 2019 ) . I would like to know in which 12 weeks period sum of those units would be higher .  2017w1 - 2017w13 - 1000 2017w2 - 2017w14 - 1010 2017w3 - 2017w15 - 990 upto all 2018 end and need to find the greatest units sold . for each item .   I would also need to play with the interval changing from 12 to 6 or 3 based on different scenarios .   Thanks, Subhash ... View more