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Subrange notation such as [i-5:i+5] can be used to perform calculations over a range of cells.

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For example:

1. Fill column A with some dataEnter StdDev(col(A)[i-5:i+5]) as the formula for column B. row numbers.
2. Open Set Column Values dialog of col(B).
3. Choose Formula: Load Sample: Moving Standard Deviations and click OK.

Then column B will be filled with the running-standard deviation over 11 points, at every row, based on the data in column A.