Function stdev

pattern/db/__init__.py:349–354

Returns the standard deviation of the given list of values. Low standard deviation => values are close to the mean. High standard deviation => values are spread out over a large range.

(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.
        Low standard deviation => values are close to the mean.
        High standard deviation => values are spread out over a large range.
    """
    return sqrt(variance(list))

#### SQLITE FUNCTIONS ##############################################################################
# Convenient MySQL functions not in in pysqlite2. These are created at each Database.connect().