Exponentiated Weibull distribution

The probability density function for the exponentiated Weibull distribution is:

.. math::

f(x,a,c) = ac[1-\exp(-x^c)]^{a-1} \exp(-x^c)x^{c-1}

The cumulative distribution function is:

.. math::

F(x,a,c) = [1-\exp(-x^c)]^a

The following plots show the pdf and cdf:

.. image:: ../../../../tests/imgs/stats/continuous/exponweib/exponweibpdf.png :align: center :width: 480

.. image:: ../../../../tests/imgs/stats/continuous/exponweib/exponweibcdf.png :align: center :width: 480