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3 Month Moving average with three criterias

ovelove
ovelove asked
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Last Modified: 2016-03-16
Looking for a way to calculate a three month average with three criterias (Transaction date, Area and product id).

Current code is: MovingAverage: DAvg("Sales","Table1","Area ='" & [Area] & "' AND Month(format(TransactionDate,'mm/dd/yyyy') <" & (Month(Format([TransactionDate],'mm/dd/yyyy')+2)\3))

Struggeling with the Transaction date as I only receive an error in the query (the data is only monthly and all data is therefor set to 1/1/2015 for Jan and 2/1/2015 for feb).

I would also need product ID to be part of the criteria for the three month moving average.

Any suggestions?  I've attached the test database as well.
3-16-2016-11-30-03-AM.png
3-16-2016-11-30-18-AM.png
TEST--2---4-.mdb
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