INNER CODE UNIT · Python

segno

mszell/geospatialdatascience · unit11_mobilityindividual/stats_utils.py:24

def segno(x):
    """
    Input:  x, a number
    Return:  1.0  if x>0,
            -1.0  if x<0,
             0.0  if x==0
    """
    if   x  > 0.0: return 1.0
    elif x  < 0.0: return -1.0
    elif x == 0.0: return 0.0


def standard_dev(list):
    ll = len(list)
    m = 1.0 * sum(list)/ll
    return ( sum([(elem-m)**2.0 for elem in list]) / ll )**0.5

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