Class BasicStats

Stores all statistics commonly used ranking methods.

This is a Lucene.NET EXPERIMENTAL API, use at your own risk
Inheritance
System.Object
Similarity.SimWeight
BasicStats
LMSimilarity.LMStats
Namespace: Lucene.Net.Search.Similarities
Assembly: Lucene.Net.dll
Syntax
public class BasicStats : Similarity.SimWeight

Constructors

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BasicStats(String, Single)

Constructor. Sets the query boost.

Declaration
public BasicStats(string field, float queryBoost)
Parameters
Type Name Description
System.String field
System.Single queryBoost

Fields

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m_avgFieldLength

The average field length.

Declaration
protected float m_avgFieldLength
Field Value
Type Description
System.Single
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m_docFreq

The document frequency.

Declaration
protected long m_docFreq
Field Value
Type Description
System.Int64
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m_numberOfDocuments

The number of documents.

Declaration
protected long m_numberOfDocuments
Field Value
Type Description
System.Int64
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m_numberOfFieldTokens

The total number of tokens in the field.

Declaration
protected long m_numberOfFieldTokens
Field Value
Type Description
System.Int64
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m_queryBoost

Query's inner boost.

Declaration
protected readonly float m_queryBoost
Field Value
Type Description
System.Single
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m_topLevelBoost

Any outer query's boost.

Declaration
protected float m_topLevelBoost
Field Value
Type Description
System.Single
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m_totalBoost

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.

Declaration
protected float m_totalBoost
Field Value
Type Description
System.Single
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m_totalTermFreq

The total number of occurrences of this term across all documents.

Declaration
protected long m_totalTermFreq
Field Value
Type Description
System.Int64

Properties

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AvgFieldLength

Returns the average field length.

Declaration
public virtual float AvgFieldLength { get; set; }
Property Value
Type Description
System.Single
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DocFreq

Returns the document frequency.

Declaration
public virtual long DocFreq { get; set; }
Property Value
Type Description
System.Int64
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Field

The field.

Declaration
public string Field { get; }
Property Value
Type Description
System.String
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NumberOfDocuments

Gets or Sets the number of documents.

Declaration
public virtual long NumberOfDocuments { get; set; }
Property Value
Type Description
System.Int64
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NumberOfFieldTokens

Returns the total number of tokens in the field.

Declaration
public virtual long NumberOfFieldTokens { get; set; }
Property Value
Type Description
System.Int64
See Also
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TotalBoost

Returns the total boost.

Declaration
public virtual float TotalBoost { get; }
Property Value
Type Description
System.Single
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TotalTermFreq

Returns the total number of occurrences of this term across all documents.

Declaration
public virtual long TotalTermFreq { get; set; }
Property Value
Type Description
System.Int64

Methods

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GetValueForNormalization()

The square of the raw normalization value.

Declaration
public override float GetValueForNormalization()
Returns
Type Description
System.Single
Overrides
See Also
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Normalize(Single, Single)

No normalization is done. topLevelBoost is saved in the object, however.

Declaration
public override void Normalize(float queryNorm, float topLevelBoost)
Parameters
Type Name Description
System.Single queryNorm
System.Single topLevelBoost
Overrides
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RawNormalizationValue()

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 Normalize(Single, Single), etc.

Declaration
protected virtual float RawNormalizationValue()
Returns
Type Description
System.Single