.. only:: html

    .. note::
        :class: sphx-glr-download-link-note

        Click :ref:`here <sphx_glr_download_auto_data_analysis_statistical_hypothesis_testing_plot_chi2_fitting_test.py>`     to download the full example code
    .. rst-class:: sphx-glr-example-title

    .. _sphx_glr_auto_data_analysis_statistical_hypothesis_testing_plot_chi2_fitting_test.py:


Distribution fitting test using Chi2
====================================

In this example we are going to perform a Chi2 goodness-of-fit test for an 1-d discrete distribution.


.. code-block:: default

    from __future__ import print_function
    import openturns as ot
    import openturns.viewer as viewer
    from matplotlib import pylab as plt
    ot.Log.Show(ot.Log.NONE)








Create data


.. code-block:: default

    distribution = ot.Poisson()
    sample = distribution.getSample(30)








Fit a Poisson distribution


.. code-block:: default

    distribution = ot.PoissonFactory().build(sample)








Test the fitted distribution


.. code-block:: default

    result = ot.FittingTest.ChiSquared(sample, distribution, 0.01)
    print('Conclusion=', result.getBinaryQualityMeasure(), 'P-value=', result.getPValue())




.. rst-class:: sphx-glr-script-out

 Out:

 .. code-block:: none

    Conclusion= True P-value= 0.7146093983625044





.. rst-class:: sphx-glr-timing

   **Total running time of the script:** ( 0 minutes  0.002 seconds)


.. _sphx_glr_download_auto_data_analysis_statistical_hypothesis_testing_plot_chi2_fitting_test.py:


.. only :: html

 .. container:: sphx-glr-footer
    :class: sphx-glr-footer-example



  .. container:: sphx-glr-download sphx-glr-download-python

     :download:`Download Python source code: plot_chi2_fitting_test.py <plot_chi2_fitting_test.py>`



  .. container:: sphx-glr-download sphx-glr-download-jupyter

     :download:`Download Jupyter notebook: plot_chi2_fitting_test.ipynb <plot_chi2_fitting_test.ipynb>`


.. only:: html

 .. rst-class:: sphx-glr-signature

    `Gallery generated by Sphinx-Gallery <https://sphinx-gallery.github.io>`_