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 FUNCTION AVARIANCE()

  Short:
  ------
  AVARIANCE() Determines the variance of an array with condition


  Returns:
  --------
  <nVariance> => Array variance

  Syntax:
  -------
  AVARIANCE(aTarget,[bCondition])

  Description:
  ------------
  <aTarget> is the target array. Normally an array of
  numeric values. [bCondition] is an optional codeblock used to
  select a subset of the array. This could be used to filter out
  0's or non-numeric elements. The block must accept an array
  element as a parameter, and return true or false <expL> to
  determine if this element is part of the desired subset.

  Examples:
  ---------
   v := AVARIANCE(aSales)
   v := AVARIANCE(aSales,{|e|valtype(e)=="N".and.e<>0})

  Source:
  -------
  S_ASTATS.PRG