STD

Returns the sample standard deviation of the values in a data set (this is the square root of the sample variance).

Syntax:

STD(list)

Calculates the sample standard deviation of the values in the list, which may be an array, a range of cells, or a comma-separated list of values.

The equation used is:

√( (n·Σi=n (xi2) − (Σi=n xi)2) ÷ (n·(n − 1)) )

where xi is each value and n is the number of values.

Example:

STD(A1:A15)

returns the standard deviation of the contents of cells in the range A1 to A15.