Moyal distribution

The probability density function for Moyal distribution is:

.. math::

f(x) = \exp(-(x + \exp(-x))/2) / \sqrt{2\pi}

for a real number :math:x.

The following plots show the pdf and cdf:

.. image:: ../../../../tests/imgs/stats/continuous/moyal/moyalpdf.png :align: center :width: 480

.. image:: ../../../../tests/imgs/stats/continuous/moyal/moyalcdf.png :align: center :width: 480