Independence (elasticsearch-extend 3.2 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.

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