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| <a name="boost.accumulators.impl.weighted_variance_impl"></a><div class="titlepage"></div> |
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| <h2><span class="refentrytitle">Struct template weighted_variance_impl</span></h2> |
| <p>boost::accumulators::impl::weighted_variance_impl — Iterative calculation of variance of weighted samples. </p> |
| </div> |
| <h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2> |
| <div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: <<a class="link" href="../../../accumulators/reference.html#header.boost.accumulators.statistics.weighted_variance_hpp" title="Header <boost/accumulators/statistics/weighted_variance.hpp>">boost/accumulators/statistics/weighted_variance.hpp</a>> |
| |
| </span><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Sample<span class="special">,</span> <span class="keyword">typename</span> Weight<span class="special">,</span> <span class="keyword">typename</span> MeanFeature<span class="special">,</span> <span class="keyword">typename</span> Tag<span class="special">></span> |
| <span class="keyword">struct</span> <a class="link" href="weighted_variance_impl.html" title="Struct template weighted_variance_impl">weighted_variance_impl</a> <span class="special">{</span> |
| <span class="comment">// types</span> |
| <span class="keyword">typedef</span> <span class="identifier">numeric</span><span class="special">::</span><span class="identifier">functional</span><span class="special">::</span><span class="identifier">multiplies</span><span class="special"><</span> <span class="identifier">Sample</span><span class="special">,</span> <span class="identifier">Weight</span> <span class="special">></span><span class="special">::</span><span class="identifier">result_type</span> <a name="boost.accumulators.impl.weighted_variance_impl.weighted_sample"></a><span class="identifier">weighted_sample</span><span class="special">;</span> |
| <span class="keyword">typedef</span> <span class="identifier">numeric</span><span class="special">::</span><span class="identifier">functional</span><span class="special">::</span><span class="identifier">average</span><span class="special"><</span> <span class="identifier">weighted_sample</span><span class="special">,</span> <span class="identifier">Weight</span> <span class="special">></span><span class="special">::</span><span class="identifier">result_type</span> <a name="boost.accumulators.impl.weighted_variance_impl.result_type"></a><span class="identifier">result_type</span><span class="special">;</span> |
| |
| <span class="comment">// <a class="link" href="weighted_variance_impl.html#boost.accumulators.impl.weighted_variance_implconstruct-copy-destruct">construct/copy/destruct</a></span> |
| <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Args<span class="special">></span> <a class="link" href="weighted_variance_impl.html#id572387-bb"><span class="identifier">weighted_variance_impl</span></a><span class="special">(</span><span class="identifier">Args</span> <span class="keyword">const</span> <span class="special">&</span><span class="special">)</span><span class="special">;</span> |
| |
| <span class="comment">// <a class="link" href="weighted_variance_impl.html#id572350-bb">public member functions</a></span> |
| <span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Args<span class="special">></span> <span class="keyword">void</span> <a class="link" href="weighted_variance_impl.html#id572354-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="identifier">Args</span> <span class="keyword">const</span> <span class="special">&</span><span class="special">)</span><span class="special">;</span> |
| <span class="identifier">result_type</span> <a class="link" href="weighted_variance_impl.html#id572374-bb"><span class="identifier">result</span></a><span class="special">(</span><span class="identifier">dont_care</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span> |
| <span class="special">}</span><span class="special">;</span></pre></div> |
| <div class="refsect1"> |
| <a name="id968165"></a><h2>Description</h2> |
| <p>Iterative calculation of variance of weighted samples: </p> |
| <div class="equation"> |
| <a name="id968171"></a><p class="title"><b>Equation 1.43. </b></p> |
| <div class="equation-contents"><div class="mediaobject" align="center"><img src="../../../images/accumulators/form_100.png" align="middle"></div></div> |
| </div> |
| <p><br class="equation-break"> where <span class="inlinemediaobject"><img src="../../../images/accumulators/form_82.png"></span> is the sum of the <span class="inlinemediaobject"><img src="../../../images/accumulators/form_60.png"></span> weights <span class="inlinemediaobject"><img src="../../../images/accumulators/form_83.png"></span> and <span class="inlinemediaobject"><img src="../../../images/accumulators/form_4.png"></span> the estimate of the mean of the weighted smaples. Note that the sample variance is not defined for <span class="inlinemediaobject"><img src="../../../images/accumulators/form_77.png"></span>. </p> |
| <div class="refsect2"> |
| <a name="id968300"></a><h3> |
| <a name="boost.accumulators.impl.weighted_variance_implconstruct-copy-destruct"></a><code class="computeroutput">weighted_variance_impl</code> |
| public |
| construct/copy/destruct</h3> |
| <div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem"><pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Args<span class="special">></span> <a name="id572387-bb"></a><span class="identifier">weighted_variance_impl</span><span class="special">(</span><span class="identifier">Args</span> <span class="keyword">const</span> <span class="special">&</span> args<span class="special">)</span><span class="special">;</span></pre></li></ol></div> |
| </div> |
| <div class="refsect2"> |
| <a name="id968388"></a><h3> |
| <a name="id572350-bb"></a><code class="computeroutput">weighted_variance_impl</code> public member functions</h3> |
| <div class="orderedlist"><ol class="orderedlist" type="1"> |
| <li class="listitem"><pre class="literallayout"><span class="keyword">template</span><span class="special"><</span><span class="keyword">typename</span> Args<span class="special">></span> <span class="keyword">void</span> <a name="id572354-bb"></a><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><span class="identifier">Args</span> <span class="keyword">const</span> <span class="special">&</span> args<span class="special">)</span><span class="special">;</span></pre></li> |
| <li class="listitem"><pre class="literallayout"><span class="identifier">result_type</span> <a name="id572374-bb"></a><span class="identifier">result</span><span class="special">(</span><span class="identifier">dont_care</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre></li> |
| </ol></div> |
| </div> |
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| <td align="right"><div class="copyright-footer">Copyright © 2005, 2006 Eric Niebler<p> |
| Distributed under the Boost Software License, Version 1.0. (See accompanying |
| file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>) |
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