Function sigmoid_kernel

Lib/statistics.py:840–849

()

@register('sigmoid')
def sigmoid_kernel():
    # (2/pi) / (exp(t) + exp(-t))
    c1 = 1 / pi
    c2 = 2 / pi
    c3 = pi / 2
    pdf = lambda t: c1 / cosh(t)
    cdf = lambda t: c2 * atan(exp(t))
    invcdf = lambda p: log(tan(p * c3))
    support = None
    return pdf, cdf, invcdf, support

@register('rectangular', 'uniform')
def rectangular_kernel():