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Subrange notation such as [i-5:i+5] can be used to perform calculations over a range of cells.
For example:
- Fill column A with some datarow numbers.
- Enter StdDev(col(A)[i-5:i+5]) as the formula for column B. Then column B will be filled with the running-standard deviation over 11 points, at every row, based on the data in column A.