Array Formula - calculating results on a rolling basis

**andrewc** · 06-03-2013, 05:05 AM

Hi,

I have in A1:A1000 a series of numerical values. In column B, from B3 onwards, there is a formula in each cell that calculates the compounded value of the 3 previous values in column A using the following formula:

e.g. {=(product(1+A1:A3/100)-1)*100} in B3

In B4 the formula would be {=(product(1+A2:A4/100)-1)*100} etc

Finally I calculate the average of the values in column B.

Instead of using the “helper” column B as described above, is it possible to create a single array formula that calculates from the data in column A each of the compounded values, as in column B, and returns the average of the results?

Thanks!

**:) Sixthsense :)** · 06-03-2013, 05:46 AM

Please attach a sample workbook with expected result for giving exact solution

**andrewc** · 06-03-2013, 07:54 AM

Hi,

Here is what the data looks like. The data in the first column starts at A1 and continues down to A1000, while the data in the adjacent column starts at B3:

1
2
3 6.11 {=(PRODUCT(1+A1:A3/100)-1)*100}
4 9.26 {=(PRODUCT(1+A2:A4/100)-1)*100}

Average 7.69 =AVERAGE(B3:B4)

Thanks!

**zbor** · 06-03-2013, 08:08 AM

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