The STANDARD-DEVIATION function returns a numeric value that approximates the standard deviation of its arguments. The type of this function is numeric.




argument-1 Must be class numeric.

Returned Values

  1. The returned value is the approximation of the standard deviation of the argument-1 series.
  2. 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.
  3. 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.