I have my report in BIDS like this
Absences
4/1/2011 4/8/2011 4/15/2011 ... 6/10/2011 6/17/2011 Average Two week average
42 53 1 3 2 (how to compute this?)
I can get the total average just fine. I'm not sure how I can work with expressions to calculate the average for the two previous weeks.