Independence (Lucene 9.11.1 core API)

java.lang.Object
- org.apache.lucene.search.similarities.Independence

Direct Known Subclasses:

IndependenceChiSquared, IndependenceSaturated, IndependenceStandardized
```
public abstract class Independence
extends Object
```
Computes the measure of divergence from independence for DFI scoring functions.
See http://trec.nist.gov/pubs/trec21/papers/irra.web.nb.pdf for more information on different methods.

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

Constructor Summary

Constructors
Constructor Description

Independence()
Sole constructor.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`abstract double`	`score(double freq, double expected)`	Computes distance from independence
`abstract String`	`toString()`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Constructor Detail
  - Independence
```
public Independence()
```
    Sole constructor. (For invocation by subclass constructors, typically implicit.)
- Method Detail
  - score
```
public abstract double score(double freq,
                             double expected)
```
    Computes distance from independence
    
    Parameters:
    
    freq - actual term frequency
    
    expected - expected term frequency
  - toString
```
public abstract String toString()
```
    Overrides:
    
    toString in class Object