Function variance

pattern/db/__init__.py:342–347

Returns the variance of the given list of values. The variance is the average of squared deviations from the mean.

(list)

    return float(_sum(list)) / (len(list) or 1)
    
def variance(list):
    """ Returns the variance of the given list of values.
        The variance is the average of squared deviations from the mean.
    """
    a = avg(list)
    return _sum([(x-a)**2 for x in list]) / (len(list)-1 or 1)
    
def stdev(list):
    """ Returns the standard deviation of the given list of values.