Levy distribution
The probability density function for Levy distribution is:
.. math::
f(x) = \frac{1}{\sqrt{2\pi x^3}} \exp\left(-\frac{1}{2x}\right)
for a real number :math:x > 0.
The following plots show the pdf and cdf:
.. image:: ../../../../tests/imgs/stats/continuous/levy/levypdf.png :align: center :width: 480
.. image:: ../../../../tests/imgs/stats/continuous/levy/levycdf.png :align: center :width: 480