Re: Looking for rolling average for prior 12 values
No, that didn't quite do it. The average should be around 0.42 but the result with the addition you provided yields 0.10.
Would it help if that the periodicity column is called "Reporting Month-Year"? Perhaps adding that in somehow would help. The Month Year I'm using is customized so maybe that's why your answer didn't work. I'm using "Reporting Month-Year" instead.