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Calculate Average for same period last year
I need to calculate the average rate both Year To Date and for the same
period last year. I have two rows of data. Row 1 shows Current Year average rates per month (all zeros after previous month; ie April - December are currently zero) Row 2 shows Last Year average rates per month (all months have positive values). I've used the formula =SUM(C35:N35)/(COUNTIF(C35:N35,"<0")) to get the average rate for the Current Year but, I also want to be able to automatically calculate the average rate for the same period last year (ie Jan - March only in this example). |
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