NormalizationZ (Lucene 7.7.0 API)

java.lang.Object
- org.apache.lucene.search.similarities.Normalization
- - org.apache.lucene.search.similarities.NormalizationZ

```
public class NormalizationZ
extends Normalization
```
Pareto-Zipf Normalization

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

Nested Class Summary
- Nested classes/interfaces inherited from class org.apache.lucene.search.similarities.Normalization
  Normalization.NoNormalization

Constructor Summary

Constructors
Constructor Description

NormalizationZ()
Calls NormalizationZ(0.3)

NormalizationZ(float z)
Creates NormalizationZ with the supplied parameter z.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`float`	`getZ()`	Returns the parameter `z`
`float`	`tfn(BasicStats stats, float tf, float len)`	Returns the normalized term frequency.
`String`	`toString()`	Subclasses must override this method to return the code of the normalization formula.

Methods inherited from class org.apache.lucene.search.similarities.Normalization
explain

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

- Constructor Detail
  - NormalizationZ
```
public NormalizationZ()
```
    Calls NormalizationZ(0.3)
  - NormalizationZ
```
public NormalizationZ(float z)
```
    Creates NormalizationZ with the supplied parameter z.
    
    Parameters:
    
    z - represents A/(A+1) where A measures the specificity of the language.
- Method Detail
  - tfn
```
public float tfn(BasicStats stats,
                 float tf,
                 float len)
```
    Description copied from class: Normalization
    
    Returns the normalized term frequency.
    
    Specified by:
    
    tfn in class Normalization
    
    len - the field length.
  - toString
```
public String toString()
```
    Description copied from class: Normalization
    
    Subclasses must override this method to return the code of the normalization formula. Refer to the original paper for the list.
    
    Specified by:
    
    toString in class Normalization
  - getZ
```
public float getZ()
```
    Returns the parameter z
    
    See Also:
    
    NormalizationZ(float)