Left-skewed Levy distribution

The probability density function for left-skewed Levy distribution is:

.. math::

f(x) = \frac{1}{|x| \sqrt{2\pi |x|}} \exp{ \left(-\frac{1}{2|x|} \right)}

for a real number :math:x \le 0.

The following plots show the pdf and cdf:

.. image:: ../../../../tests/imgs/stats/continuous/levy_l/levy_lpdf.png :align: center :width: 480

.. image:: ../../../../tests/imgs/stats/continuous/levy_l/levy_lcdf.png :align: center :width: 480