Chisq distribution

A chisq continuous random variable.

Notes

The probability density function for :math:\chi^2-distribution is:

.. math::

f(x, k) = \frac{1}{2^{k/2} \Gamma \left( k/2 \right)}
       x^{k/2-1} \exp \left( -x/2 \right)

for :math:x > 1 and :math:k > 0 (degrees of freedom).

The following plot shows the pdf.

.. image:: ../../../../tests/imgs/stats/continuous/chisq/chisqpdf.png :align: center :width: 480