Class IndependenceChiSquared
- java.lang.Object
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- org.apache.lucene.search.similarities.Independence
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- org.apache.lucene.search.similarities.IndependenceChiSquared
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public class IndependenceChiSquared extends Independence
Normalized chi-squared measure of distance from independenceDescribed as: "can be used for tasks that require high precision, against both short and long queries."
- WARNING: This API is experimental and might change in incompatible ways in the next release.
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Constructor Summary
Constructors Constructor Description IndependenceChiSquared()Sole constructor.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description doublescore(double freq, double expected)Computes distance from independenceStringtoString()
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Method Detail
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score
public double score(double freq, double expected)Description copied from class:IndependenceComputes distance from independence- Specified by:
scorein classIndependence- Parameters:
freq- actual term frequencyexpected- expected term frequency
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toString
public String toString()
- Specified by:
toStringin classIndependence
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