The STANDARD-DEVIATION function returns a numeric value that approximates the standard deviation of its arguments. The type
of this function is numeric.
Usage
FUNCTION STANDARD-DEVIATION ({argument-1} ... )
Parameter
|
argument-1
|
Must be class numeric.
|
Returned Values
- The returned value is the approximation of the standard deviation of the
argument-1 series.
- The returned value is calculated as follows:
| 1.
|
The difference between each
argument-1 value and the arithmetic mean of the
argument-1 series is calculated and squared.
|
| 2.
|
The values obtained are then added together. This quantity is divided by the number of values in the
argument-1 series.
|
| 3.
|
The square root of the quotient obtained is then calculated. The returned value is the absolute value of the square root.
|
- 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.