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| Apache Lucene.NET 4.8.0-beta00013 Documentation </title>
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<article class="content wrap" id="_content" data-uid="Lucene.Net.Search.Similarities.BasicStats">
<h1 id="Lucene_Net_Search_Similarities_BasicStats" data-uid="Lucene.Net.Search.Similarities.BasicStats" class="text-break">Class BasicStats
</h1>
<div class="markdown level0 summary"><p>Stores all statistics commonly used ranking methods.
<p>
<div class="lucene-block lucene-experimental">This is a Lucene.NET EXPERIMENTAL API, use at your own risk</div></div>
<div class="markdown level0 conceptual"></div>
<div class="inheritance">
<h5>Inheritance</h5>
<div class="level0"><span class="xref">System.Object</span></div>
<div class="level1"><a class="xref" href="Lucene.Net.Search.Similarities.Similarity.SimWeight.html">Similarity.SimWeight</a></div>
<div class="level2"><span class="xref">BasicStats</span></div>
<div class="level3"><a class="xref" href="Lucene.Net.Search.Similarities.LMSimilarity.LMStats.html">LMSimilarity.LMStats</a></div>
</div>
<div class="inheritedMembers">
<h5>Inherited Members</h5>
<div>
<span class="xref">System.Object.Equals(System.Object)</span>
</div>
<div>
<span class="xref">System.Object.Equals(System.Object, System.Object)</span>
</div>
<div>
<span class="xref">System.Object.GetHashCode()</span>
</div>
<div>
<span class="xref">System.Object.GetType()</span>
</div>
<div>
<span class="xref">System.Object.MemberwiseClone()</span>
</div>
<div>
<span class="xref">System.Object.ReferenceEquals(System.Object, System.Object)</span>
</div>
<div>
<span class="xref">System.Object.ToString()</span>
</div>
</div>
<h6><strong>Namespace</strong>: <a class="xref" href="Lucene.Net.Search.Similarities.html">Lucene.Net.Search.Similarities</a></h6>
<h6><strong>Assembly</strong>: Lucene.Net.dll</h6>
<h5 id="Lucene_Net_Search_Similarities_BasicStats_syntax">Syntax</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public class BasicStats : Similarity.SimWeight</code></pre>
</div>
<h3 id="constructors">Constructors
</h3>
<span class="small pull-right mobile-hide">
<span class="divider">|</span>
<a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00013/websites/apidocs/apiSpec/new?filename=Lucene_Net_Search_Similarities_BasicStats__ctor_System_String_System_Single_.md&amp;value=---%0Auid%3A%20Lucene.Net.Search.Similarities.BasicStats.%23ctor(System.String%2CSystem.Single)%0Asummary%3A%20'*You%20can%20override%20summary%20for%20the%20API%20here%20using%20*MARKDOWN*%20syntax'%0A---%0A%0A*Please%20type%20below%20more%20information%20about%20this%20API%3A*%0A%0A">Improve this Doc</a>
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<a id="Lucene_Net_Search_Similarities_BasicStats__ctor_" data-uid="Lucene.Net.Search.Similarities.BasicStats.#ctor*"></a>
<h4 id="Lucene_Net_Search_Similarities_BasicStats__ctor_System_String_System_Single_" data-uid="Lucene.Net.Search.Similarities.BasicStats.#ctor(System.String,System.Single)">BasicStats(String, Single)</h4>
<div class="markdown level1 summary"><p>Constructor. Sets the query boost. </p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public BasicStats(string field, float queryBoost)</code></pre>
</div>
<h5 class="parameters">Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.String</span></td>
<td><span class="parametername">field</span></td>
<td></td>
</tr>
<tr>
<td><span class="xref">System.Single</span></td>
<td><span class="parametername">queryBoost</span></td>
<td></td>
</tr>
</tbody>
</table>
<h3 id="fields">Fields
</h3>
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<a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00013/websites/apidocs/apiSpec/new?filename=Lucene_Net_Search_Similarities_BasicStats_m_avgFieldLength.md&amp;value=---%0Auid%3A%20Lucene.Net.Search.Similarities.BasicStats.m_avgFieldLength%0Asummary%3A%20'*You%20can%20override%20summary%20for%20the%20API%20here%20using%20*MARKDOWN*%20syntax'%0A---%0A%0A*Please%20type%20below%20more%20information%20about%20this%20API%3A*%0A%0A">Improve this Doc</a>
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<h4 id="Lucene_Net_Search_Similarities_BasicStats_m_avgFieldLength" data-uid="Lucene.Net.Search.Similarities.BasicStats.m_avgFieldLength">m_avgFieldLength</h4>
<div class="markdown level1 summary"><p>The average field length. </p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">protected float m_avgFieldLength</code></pre>
</div>
<h5 class="fieldValue">Field Value</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Single</span></td>
<td></td>
</tr>
</tbody>
</table>
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<h4 id="Lucene_Net_Search_Similarities_BasicStats_m_docFreq" data-uid="Lucene.Net.Search.Similarities.BasicStats.m_docFreq">m_docFreq</h4>
<div class="markdown level1 summary"><p>The document frequency. </p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">protected long m_docFreq</code></pre>
</div>
<h5 class="fieldValue">Field Value</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Int64</span></td>
<td></td>
</tr>
</tbody>
</table>
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<h4 id="Lucene_Net_Search_Similarities_BasicStats_m_numberOfDocuments" data-uid="Lucene.Net.Search.Similarities.BasicStats.m_numberOfDocuments">m_numberOfDocuments</h4>
<div class="markdown level1 summary"><p>The number of documents. </p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">protected long m_numberOfDocuments</code></pre>
</div>
<h5 class="fieldValue">Field Value</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Int64</span></td>
<td></td>
</tr>
</tbody>
</table>
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<h4 id="Lucene_Net_Search_Similarities_BasicStats_m_numberOfFieldTokens" data-uid="Lucene.Net.Search.Similarities.BasicStats.m_numberOfFieldTokens">m_numberOfFieldTokens</h4>
<div class="markdown level1 summary"><p>The total number of tokens in the field. </p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">protected long m_numberOfFieldTokens</code></pre>
</div>
<h5 class="fieldValue">Field Value</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Int64</span></td>
<td></td>
</tr>
</tbody>
</table>
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<h4 id="Lucene_Net_Search_Similarities_BasicStats_m_queryBoost" data-uid="Lucene.Net.Search.Similarities.BasicStats.m_queryBoost">m_queryBoost</h4>
<div class="markdown level1 summary"><p>Query&apos;s inner boost. </p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">protected readonly float m_queryBoost</code></pre>
</div>
<h5 class="fieldValue">Field Value</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Single</span></td>
<td></td>
</tr>
</tbody>
</table>
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<a href="https://github.com/apache/lucenenet/new/docs/4.8.0-beta00013/websites/apidocs/apiSpec/new?filename=Lucene_Net_Search_Similarities_BasicStats_m_topLevelBoost.md&amp;value=---%0Auid%3A%20Lucene.Net.Search.Similarities.BasicStats.m_topLevelBoost%0Asummary%3A%20'*You%20can%20override%20summary%20for%20the%20API%20here%20using%20*MARKDOWN*%20syntax'%0A---%0A%0A*Please%20type%20below%20more%20information%20about%20this%20API%3A*%0A%0A">Improve this Doc</a>
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<h4 id="Lucene_Net_Search_Similarities_BasicStats_m_topLevelBoost" data-uid="Lucene.Net.Search.Similarities.BasicStats.m_topLevelBoost">m_topLevelBoost</h4>
<div class="markdown level1 summary"><p>Any outer query&apos;s boost. </p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">protected float m_topLevelBoost</code></pre>
</div>
<h5 class="fieldValue">Field Value</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Single</span></td>
<td></td>
</tr>
</tbody>
</table>
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<h4 id="Lucene_Net_Search_Similarities_BasicStats_m_totalBoost" data-uid="Lucene.Net.Search.Similarities.BasicStats.m_totalBoost">m_totalBoost</h4>
<div class="markdown level1 summary"><p>For most Similarities, the immediate and the top level query boosts are
not handled differently. Hence, this field is just the product of the
other two.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">protected float m_totalBoost</code></pre>
</div>
<h5 class="fieldValue">Field Value</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Single</span></td>
<td></td>
</tr>
</tbody>
</table>
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<h4 id="Lucene_Net_Search_Similarities_BasicStats_m_totalTermFreq" data-uid="Lucene.Net.Search.Similarities.BasicStats.m_totalTermFreq">m_totalTermFreq</h4>
<div class="markdown level1 summary"><p>The total number of occurrences of this term across all documents. </p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">protected long m_totalTermFreq</code></pre>
</div>
<h5 class="fieldValue">Field Value</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Int64</span></td>
<td></td>
</tr>
</tbody>
</table>
<h3 id="properties">Properties
</h3>
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<a id="Lucene_Net_Search_Similarities_BasicStats_AvgFieldLength_" data-uid="Lucene.Net.Search.Similarities.BasicStats.AvgFieldLength*"></a>
<h4 id="Lucene_Net_Search_Similarities_BasicStats_AvgFieldLength" data-uid="Lucene.Net.Search.Similarities.BasicStats.AvgFieldLength">AvgFieldLength</h4>
<div class="markdown level1 summary"><p>Returns the average field length. </p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public virtual float AvgFieldLength { get; set; }</code></pre>
</div>
<h5 class="propertyValue">Property Value</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Single</span></td>
<td></td>
</tr>
</tbody>
</table>
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<a id="Lucene_Net_Search_Similarities_BasicStats_DocFreq_" data-uid="Lucene.Net.Search.Similarities.BasicStats.DocFreq*"></a>
<h4 id="Lucene_Net_Search_Similarities_BasicStats_DocFreq" data-uid="Lucene.Net.Search.Similarities.BasicStats.DocFreq">DocFreq</h4>
<div class="markdown level1 summary"><p>Returns the document frequency. </p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public virtual long DocFreq { get; set; }</code></pre>
</div>
<h5 class="propertyValue">Property Value</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Int64</span></td>
<td></td>
</tr>
</tbody>
</table>
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<a id="Lucene_Net_Search_Similarities_BasicStats_Field_" data-uid="Lucene.Net.Search.Similarities.BasicStats.Field*"></a>
<h4 id="Lucene_Net_Search_Similarities_BasicStats_Field" data-uid="Lucene.Net.Search.Similarities.BasicStats.Field">Field</h4>
<div class="markdown level1 summary"><p>The field.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public string Field { get; }</code></pre>
</div>
<h5 class="propertyValue">Property Value</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.String</span></td>
<td></td>
</tr>
</tbody>
</table>
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<a id="Lucene_Net_Search_Similarities_BasicStats_NumberOfDocuments_" data-uid="Lucene.Net.Search.Similarities.BasicStats.NumberOfDocuments*"></a>
<h4 id="Lucene_Net_Search_Similarities_BasicStats_NumberOfDocuments" data-uid="Lucene.Net.Search.Similarities.BasicStats.NumberOfDocuments">NumberOfDocuments</h4>
<div class="markdown level1 summary"><p>Gets or Sets the number of documents. </p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public virtual long NumberOfDocuments { get; set; }</code></pre>
</div>
<h5 class="propertyValue">Property Value</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Int64</span></td>
<td></td>
</tr>
</tbody>
</table>
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<a id="Lucene_Net_Search_Similarities_BasicStats_NumberOfFieldTokens_" data-uid="Lucene.Net.Search.Similarities.BasicStats.NumberOfFieldTokens*"></a>
<h4 id="Lucene_Net_Search_Similarities_BasicStats_NumberOfFieldTokens" data-uid="Lucene.Net.Search.Similarities.BasicStats.NumberOfFieldTokens">NumberOfFieldTokens</h4>
<div class="markdown level1 summary"><p>Returns the total number of tokens in the field. </p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public virtual long NumberOfFieldTokens { get; set; }</code></pre>
</div>
<h5 class="propertyValue">Property Value</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Int64</span></td>
<td></td>
</tr>
</tbody>
</table>
<h5 id="Lucene_Net_Search_Similarities_BasicStats_NumberOfFieldTokens_seealso">See Also</h5>
<div class="seealso">
<div><a class="xref" href="Lucene.Net.Index.Terms.html#Lucene_Net_Index_Terms_SumTotalTermFreq">SumTotalTermFreq</a></div>
</div>
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<a id="Lucene_Net_Search_Similarities_BasicStats_TotalBoost_" data-uid="Lucene.Net.Search.Similarities.BasicStats.TotalBoost*"></a>
<h4 id="Lucene_Net_Search_Similarities_BasicStats_TotalBoost" data-uid="Lucene.Net.Search.Similarities.BasicStats.TotalBoost">TotalBoost</h4>
<div class="markdown level1 summary"><p>Returns the total boost. </p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public virtual float TotalBoost { get; }</code></pre>
</div>
<h5 class="propertyValue">Property Value</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Single</span></td>
<td></td>
</tr>
</tbody>
</table>
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<a id="Lucene_Net_Search_Similarities_BasicStats_TotalTermFreq_" data-uid="Lucene.Net.Search.Similarities.BasicStats.TotalTermFreq*"></a>
<h4 id="Lucene_Net_Search_Similarities_BasicStats_TotalTermFreq" data-uid="Lucene.Net.Search.Similarities.BasicStats.TotalTermFreq">TotalTermFreq</h4>
<div class="markdown level1 summary"><p>Returns the total number of occurrences of this term across all documents. </p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public virtual long TotalTermFreq { get; set; }</code></pre>
</div>
<h5 class="propertyValue">Property Value</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Int64</span></td>
<td></td>
</tr>
</tbody>
</table>
<h3 id="methods">Methods
</h3>
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<h4 id="Lucene_Net_Search_Similarities_BasicStats_GetValueForNormalization" data-uid="Lucene.Net.Search.Similarities.BasicStats.GetValueForNormalization">GetValueForNormalization()</h4>
<div class="markdown level1 summary"><p>The square of the raw normalization value. </p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public override float GetValueForNormalization()</code></pre>
</div>
<h5 class="returns">Returns</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Single</span></td>
<td></td>
</tr>
</tbody>
</table>
<h5 class="overrides">Overrides</h5>
<div><a class="xref" href="Lucene.Net.Search.Similarities.Similarity.SimWeight.html#Lucene_Net_Search_Similarities_Similarity_SimWeight_GetValueForNormalization">Similarity.SimWeight.GetValueForNormalization()</a></div>
<h5 id="Lucene_Net_Search_Similarities_BasicStats_GetValueForNormalization_seealso">See Also</h5>
<div class="seealso">
<div><a class="xref" href="Lucene.Net.Search.Similarities.BasicStats.html#Lucene_Net_Search_Similarities_BasicStats_RawNormalizationValue">RawNormalizationValue()</a></div>
</div>
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<a id="Lucene_Net_Search_Similarities_BasicStats_Normalize_" data-uid="Lucene.Net.Search.Similarities.BasicStats.Normalize*"></a>
<h4 id="Lucene_Net_Search_Similarities_BasicStats_Normalize_System_Single_System_Single_" data-uid="Lucene.Net.Search.Similarities.BasicStats.Normalize(System.Single,System.Single)">Normalize(Single, Single)</h4>
<div class="markdown level1 summary"><p>No normalization is done. <code data-dev-comment-type="paramref" class="paramref">topLevelBoost</code> is saved in the object,
however.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">public override void Normalize(float queryNorm, float topLevelBoost)</code></pre>
</div>
<h5 class="parameters">Parameters</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Name</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Single</span></td>
<td><span class="parametername">queryNorm</span></td>
<td></td>
</tr>
<tr>
<td><span class="xref">System.Single</span></td>
<td><span class="parametername">topLevelBoost</span></td>
<td></td>
</tr>
</tbody>
</table>
<h5 class="overrides">Overrides</h5>
<div><a class="xref" href="Lucene.Net.Search.Similarities.Similarity.SimWeight.html#Lucene_Net_Search_Similarities_Similarity_SimWeight_Normalize_System_Single_System_Single_">Similarity.SimWeight.Normalize(Single, Single)</a></div>
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<a id="Lucene_Net_Search_Similarities_BasicStats_RawNormalizationValue_" data-uid="Lucene.Net.Search.Similarities.BasicStats.RawNormalizationValue*"></a>
<h4 id="Lucene_Net_Search_Similarities_BasicStats_RawNormalizationValue" data-uid="Lucene.Net.Search.Similarities.BasicStats.RawNormalizationValue">RawNormalizationValue()</h4>
<div class="markdown level1 summary"><p>Computes the raw normalization value. This basic implementation returns
the query boost. Subclasses may override this method to include other
factors (such as idf), or to save the value for inclusion in
<a class="xref" href="Lucene.Net.Search.Similarities.BasicStats.html#Lucene_Net_Search_Similarities_BasicStats_Normalize_System_Single_System_Single_">Normalize(Single, Single)</a>, etc.</p>
</div>
<div class="markdown level1 conceptual"></div>
<h5 class="decalaration">Declaration</h5>
<div class="codewrapper">
<pre><code class="lang-csharp hljs">protected virtual float RawNormalizationValue()</code></pre>
</div>
<h5 class="returns">Returns</h5>
<table class="table table-bordered table-striped table-condensed">
<thead>
<tr>
<th>Type</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td><span class="xref">System.Single</span></td>
<td></td>
</tr>
</tbody>
</table>
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