standard deviation

3 definitions found

standard deviation - WordNet (r) 2.1 (2005) :

  standard deviation
      n 1: the square root of the variance

standard deviation - Free On-line Dictionary of Computing (26 May 2007) :

  standard deviation
  
     <statistics> (SD) A measure of the range of values in a set of
     numbers.  Standard deviation is a statistic used as a measure
     of the dispersion or variation in a distribution, equal to the
     square root of the arithmetic mean of the squares of the
     deviations from the arithmetic mean.
  
     The standard deviation of a random variable or list of numbers
     (the lowercase greek sigma) is the square of the variance.
     The standard deviation of the list x1, x2, x3...xn is given by
     the formula:
  
      sigma = sqrt(((x1-(avg(x)))^2 + (x1-(avg(x)))^2 +
                   ...  + (xn(avg(x)))^2)/n)
  
     The formula is used when all of the values in the population
     are known.  If the values x1...xn are a random sample chosen
     from the population, then the sample Standard Deviation is
     calculated with same formula, except that (n-1) is used as the
     denominator.
  
     [dictionary.com (http://dictionary.com/)].
  
     ["Barrons Dictionary of Mathematical Terms, second edition"].
  
     (2003-05-06)
  

standard deviation - Moby Thesaurus II by Grady Ward, 1.0 :

  31 Moby Thesaurus words for "standard deviation":
     allowance, approximation, deviation, frequency curve,
     frequency distribution, game theory, imprecision, inaccuracy,
     inaccurateness, incorrectness, inexactitude, inexactness, laxity,
     looseness, mathematical probability, negligence,
     operations research, predictability, predictable error,
     probability theory, probable error, quantum mechanics,
     statistical mechanics, statistical probability, statistics,
     tolerance, uncertainty principle, uncorrectness, unfactualness,
     unpreciseness, unrigorousness