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3 month rolling count

3 month rolling count

3 month rolling count

I have a report where I want to count users by month and last 3 months. I have grouped by month and by customer. some customers may not have a count in consecutive months, so I don't just want the last three groups total I want the last 3 calendar months total.
When I run the report I want to cut it off for the month end of the month prior to run date.
my date field is a date time so when I group it I am using the group expert "for each month"


ABC Co last month count last 3 months
1/2015 5 5
2/2015 2 7
3/2015 10 17
5/2015 3 13
6/2015 7 10
7/2015 4 14
8/2015 6 17

XYZ Co last month count last 3 months
1/2015 5 5
2/2015 6 11
3/2015 7 18
4/2015 3 16
6/2015 10 13
9/2015 20 20

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