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7.1.47 VARIANCE
The VARIANCE function returns a numeric value that approximates the variance of its arguments.
The function type is numeric. 



    ___ Format _____________________________________________________________ 
   |                                                                        |
   |                           <____________                                |
   | >>__FUNCTION VARIANCE__(____argument-1_|__)_________________________>< |
   |                                                                        |
   |________________________________________________________________________|
argument-1
Must be class numeric.
The returned value is the approximation of the variance of the argument-1 series.
The returned value is defined as the square of the standard deviation of the argument-1 series. This 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 series.
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.

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