IndependenceChiSquared (Lucene 9.12.2 core API)

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

```
public class IndependenceChiSquared
extends Independence
```
Normalized chi-squared measure of distance from independence
Described 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.

Constructor Summary

Constructors
Constructor Description

IndependenceChiSquared()
Sole constructor.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	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
  - IndependenceChiSquared
```
public IndependenceChiSquared()
```
    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