org.apache.lucene.search.similarities

Class IndependenceStandardized

java.lang.Object

org.apache.lucene.search.similarities.Independence

org.apache.lucene.search.similarities.IndependenceStandardized

public class IndependenceStandardized
extends Independence

Standardized measure of distance from independence

Described as: "good at tasks that require high recall and high precision, especially against short queries composed of a few words as in the case of Internet searches"

WARNING: This API is experimental and might change in incompatible ways in the next release.

Constructor Summary

Constructors

Constructor and Description
IndependenceStandardized() Sole constructor.

Method Summary

Modifier and Type	Method and Description
double	score(double freq, double expected) Computes distance from independence
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

IndependenceStandardized

public IndependenceStandardized()

Sole constructor.

Method Detail

score

public double score(double freq,
                    double expected)

Description copied from class: Independence

Computes distance from independence

Specified by:

score in class Independence

Parameters:

freq - actual term frequency

expected - expected term frequency

toString

public String toString()

Specified by:

toString in class Independence