Inverted Weibull distribution

The probability density function for the inverted Weibull distribution is:

.. math::

f(x, k) = k x^{-k-1} \\exp(-x^{-k})

where :math:x > 0, k > 0. The following plots show the pdf and cdf:

.. image:: ../../../../tests/imgs/stats/continuous/invweibull/invweibullpdf.png :align: center :width: 480

.. image:: ../../../../tests/imgs/stats/continuous/invweibull/invweibullcdf.png :align: center :width: 480