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  StdDev

   The StdDev function calculates the standard deviation of the
   given field or variable.  If the Sample flag is set to .f.
   (Default) the data is treated as that of a given population, if the
   flag is set to .t. the data is treated as a sample of a population.

   Example
     .Fields
     Age
     *
     .Variables
     AgeStdDev := STDDEV Age
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