The STANDARD-DEVIATION function returns a numeric value that approximates the standard deviation of its arguments.
The function type is numeric.
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The returned value is the approximation of the standard deviation of the argument-1 series. The returned value is calculated as follows:
If the argument-1 series consists of only one value, or if the argument-1 series consists of all variable-occurrence data items and the total number of occurrences for all of them is one, the returned value is zero.