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<!doctype html>
<html lang="en" class="no-js">
<head>
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<title>About statsmodels - statsmodels 0.15.0 (+617)</title>
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statsmodels 0.15.0 (+617)
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About statsmodels
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 496 512"><!--! Font Awesome Free 6.2.0 by @fontawesome - https://fontawesome.com License - https://fontawesome.com/license/free (Icons: CC BY 4.0, Fonts: SIL OFL 1.1, Code: MIT License) Copyright 2022 Fonticons, Inc.--><path d="M165.9 397.4c0 2-2.3 3.6-5.2 3.6-3.3.3-5.6-1.3-5.6-3.6 0-2 2.3-3.6 5.2-3.6 3-.3 5.6 1.3 5.6 3.6zm-31.1-4.5c-.7 2 1.3 4.3 4.3 4.9 2.6 1 5.6 0 6.2-2s-1.3-4.3-4.3-5.2c-2.6-.7-5.5.3-6.2 2.3zm44.2-1.7c-2.9.7-4.9 2.6-4.6 4.9.3 2 2.9 3.3 5.9 2.6 2.9-.7 4.9-2.6 4.6-4.6-.3-1.9-3-3.2-5.9-2.9zM244.8 8C106.1 8 0 113.3 0 252c0 110.9 69.8 205.8 169.5 239.2 12.8 2.3 17.3-5.6 17.3-12.1 0-6.2-.3-40.4-.3-61.4 0 0-70 15-84.7-29.8 0 0-11.4-29.1-27.8-36.6 0 0-22.9-15.7 1.6-15.4 0 0 24.9 2 38.6 25.8 21.9 38.6 58.6 27.5 72.9 20.9 2.3-16 8.8-27.1 16-33.7-55.9-6.2-112.3-14.3-112.3-110.5 0-27.5 7.6-41.3 23.6-58.9-2.6-6.5-11.1-33.3 2.6-67.9 20.9-6.5 69 27 69 27 20-5.6 41.5-8.5 62.8-8.5s42.8 2.9 62.8 8.5c0 0 48.1-33.6 69-27 13.7 34.7 5.2 61.4 2.6 67.9 16 17.7 25.8 31.5 25.8 58.9 0 96.5-58.9 104.2-114.8 110.5 9.2 7.9 17 22.9 17 46.4 0 33.7-.3 75.4-.3 83.6 0 6.5 4.6 14.4 17.3 12.1C428.2 457.8 496 362.9 496 252 496 113.3 383.5 8 244.8 8zM97.2 352.9c-1.3 1-1 3.3.7 5.2 1.6 1.6 3.9 2.3 5.2 1 1.3-1 1-3.3-.7-5.2-1.6-1.6-3.9-2.3-5.2-1zm-10.8-8.1c-.7 1.3.3 2.9 2.3 3.9 1.6 1 3.6.7 4.3-.7.7-1.3-.3-2.9-2.3-3.9-2-.6-3.6-.3-4.3.7zm32.4 35.6c-1.6 1.3-1 4.3 1.3 6.2 2.3 2.3 5.2 2.6 6.5 1 1.3-1.3.7-4.3-1.3-6.2-2.2-2.3-5.2-2.6-6.5-1zm-11.4-14.7c-1.6 1-1.6 3.6 0 5.9 1.6 2.3 4.3 3.3 5.6 2.3 1.6-1.3 1.6-3.9 0-6.2-1.4-2.3-4-3.3-5.6-2z"/></svg>
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<span title="/install.rst (reference label)" class="md-ellipsis">Installing statsmodels</span>
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<h1 id="about-statsmodels"><span id="module-statsmodels"></span>About statsmodels<a class="headerlink" href="#about-statsmodels" title="Link to this heading">¶</a></h1>
<h2 id="background">Background<a class="headerlink" href="#background" title="Link to this heading">¶</a></h2>
<p>The <code class="docutils literal notranslate"><span class="pre">models</span></code> module of <code class="docutils literal notranslate"><span class="pre">scipy.stats</span></code> was originally written by Jonathan
Taylor. For some time it was part of scipy but was later removed. During
the Google Summer of Code 2009, <code class="docutils literal notranslate"><span class="pre">statsmodels</span></code> was corrected, tested,
improved and released as a new package. Since then, the statsmodels
development team has continued to add new models, plotting tools, and
statistical methods.</p>
<h2 id="testing">Testing<a class="headerlink" href="#testing" title="Link to this heading">¶</a></h2>
<p>Most results have been verified with at least one other statistical package:
R, Stata or SAS. The guiding principle for the initial rewrite and for
continued development is that all numbers have to be verified. Some
statistical methods are tested with Monte Carlo studies. While we strive to
follow this test-driven approach, there is no guarantee that the code is
bug-free and always works. Some auxiliary function are still insufficiently
tested, some edge cases might not be correctly taken into account, and the
possibility of numerical problems is inherent to many of the statistical
models. We especially appreciate any help and reports for these kind of
problems so we can keep improving the existing models.</p>
<h3 id="code-stability">Code Stability<a class="headerlink" href="#code-stability" title="Link to this heading">¶</a></h3>
<p>The existing models are mostly settled in their user interface and we do not
expect many large changes going forward. For the existing code, although
there is no guarantee yet on API stability, we have long deprecation periods
in all but very special cases, and we try to keep changes that require
adjustments by existing users to a minimal level. For newer models we might
adjust the user interface as we gain more experience and obtain feedback.
These changes will always be noted in our release notes available in the
documentation.</p>
<h3 id="reporting-bugs">Reporting Bugs<a class="headerlink" href="#reporting-bugs" title="Link to this heading">¶</a></h3>
<p>If you encounter a bug or an unexpected behavior, please report it on
<a class="reference external" href="https://github.com/statsmodels/statsmodels/issues">the issue tracker</a>.
Use the <code class="docutils literal notranslate"><span class="pre">show_versions</span></code> command to list the installed versions of
statsmodels and its dependencies.</p>
<table class="autosummary longtable docutils data align-default">
<tbody>
<tr class="row-odd"><td><p><a class="reference internal" href="generated/statsmodels.tools.print_version.show_versions.html#statsmodels.tools.print_version.show_versions" title="statsmodels.tools.print_version.show_versions (Python function) — List the versions of statsmodels and any installed dependencies"><code class="xref py py-obj docutils literal notranslate"><span class="pre">show_versions</span></code></a>([show_dirs])</p></td>
<td><p>List the versions of statsmodels and any installed dependencies</p></td>
</tr>
</tbody>
</table>
<h2 id="financial-support">Financial Support<a class="headerlink" href="#financial-support" title="Link to this heading">¶</a></h2>
<p>We are grateful for the financial support that we obtained for the
development of statsmodels:</p>
<ul class="simple">
<li><p>Google <a class="reference external" href="https://www.google.com/">www.google.com</a> : Google Summer of Code
(GSOC) 2009-2017.</p></li>
<li><p>AQR <a class="reference external" href="https://www.aqr.com/">www.aqr.com</a> : financial sponsor for the work on
Vector Autoregressive Models (VAR) by Wes McKinney</p></li>
</ul>
<p>We would also like to thank our hosting providers, <a class="reference external" href="https://github.com/">github</a> for the public code repository, <a class="reference external" href="https://www.statsmodels.org/stable/index.html">github.io</a> for hosting our documentation
and <a class="reference external" href="https://www.python.org/">python.org</a> for making our downloads available
on PyPi.</p>
<p>We also thank our current and previous continuous integration providers, <a class="reference external" href="https://azure.microsoft.com/">Azure</a>,
<a class="reference external" href="https://travis-ci.org/">Travis CI</a> and <a class="reference external" href="https://ci.appveyor.com">AppVeyor</a> for
unit testing, and <a class="reference external" href="https://codecov.io">Codecov</a> and <a class="reference external" href="https://coveralls.io">Coveralls</a> for
code coverage.</p>
<h2 id="brand-marks">Brand Marks<a class="headerlink" href="#brand-marks" title="Link to this heading">¶</a></h2>
<p>Please make use of the statsmodels logos when preparing demonstrations involving
statsmodels code.</p>
<h3 id="color">Color<a class="headerlink" href="#color" title="Link to this heading">¶</a></h3>
<table class="docutils data align-default">
<tbody>
<tr class="row-odd"><td><p>Horizontal</p></td>
<td><p><a class="reference internal" href="_images/statsmodels-logo-v2-horizontal.svg"><img alt="color-horizontal" src="_images/statsmodels-logo-v2-horizontal.svg" width="50%" /></a></p></td>
</tr>
<tr class="row-even"><td><p>Vertical</p></td>
<td><p><a class="reference internal" href="_images/statsmodels-logo-v2.svg"><img alt="color-vertical" src="_images/statsmodels-logo-v2.svg" width="14%" /></a></p></td>
</tr>
<tr class="row-odd"><td><p>Logo Only</p></td>
<td><p><a class="reference internal" href="_images/statsmodels-logo-v2-no-text.svg"><img alt="color-notext" src="_images/statsmodels-logo-v2-no-text.svg" width="9%" /></a></p></td>
</tr>
</tbody>
</table>
<h3 id="monochrome-dark">Monochrome (Dark)<a class="headerlink" href="#monochrome-dark" title="Link to this heading">¶</a></h3>
<table class="docutils data align-default">
<tbody>
<tr class="row-odd"><td><p>Horizontal</p></td>
<td><p><a class="reference internal" href="_images/statsmodels-logo-v2-horizontal-dark.svg"><img alt="dark-horizontal" src="_images/statsmodels-logo-v2-horizontal-dark.svg" width="50%" /></a></p></td>
</tr>
<tr class="row-even"><td><p>Vertical</p></td>
<td><p><a class="reference internal" href="_images/statsmodels-logo-v2-dark.svg"><img alt="dark-vertical" src="_images/statsmodels-logo-v2-dark.svg" width="14%" /></a></p></td>
</tr>
<tr class="row-odd"><td><p>Logo Only</p></td>
<td><p><a class="reference internal" href="_images/statsmodels-logo-v2-no-text-dark.svg"><img alt="dark-notext" src="_images/statsmodels-logo-v2-no-text-dark.svg" width="9%" /></a></p></td>
</tr>
</tbody>
</table>
<h3 id="monochrome-light">Monochrome (Light)<a class="headerlink" href="#monochrome-light" title="Link to this heading">¶</a></h3>
<div class="note admonition">
<p class="admonition-title">Note</p>
<p>The light brand marks are light grey on transparent, and so are difficult to see on this
page. They are intended for use on a dark background.</p>
</div>
<table class="docutils data align-default">
<tbody>
<tr class="row-odd"><td><p>Horizontal</p></td>
<td><p><a class="reference internal" href="_images/statsmodels-logo-v2-horizontal-light.svg"><img alt="light-horizontal" src="_images/statsmodels-logo-v2-horizontal-light.svg" width="50%" /></a></p></td>
</tr>
<tr class="row-even"><td><p>Vertical</p></td>
<td><p><a class="reference internal" href="_images/statsmodels-logo-v2-light.svg"><img alt="light-vertical" src="_images/statsmodels-logo-v2-light.svg" width="14%" /></a></p></td>
</tr>
<tr class="row-odd"><td><p>Logo Only</p></td>
<td><p><a class="reference internal" href="_images/statsmodels-logo-v2-no-text-light.svg"><img alt="light-notext" src="_images/statsmodels-logo-v2-no-text-light.svg" width="9%" /></a></p></td>
</tr>
</tbody>
</table>
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Feb 19, 2025
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