Mean (Apache OpenNLP Tools 2.1.1 API)

java.lang.Object
- opennlp.tools.util.eval.Mean

```
public class Mean
extends Object
```
Calculates the arithmetic mean of values added with the add(double) method.

Constructor Summary

Constructors
Constructor Description

Mean()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`add(double value)`	Adds a value to the arithmetic mean.
`void`	`add(double value, long count)`	Adds a value `count` times to the arithmetic mean.
`long`	`count()`
`double`	`mean()`
`String`	`toString()`

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

- Constructor Detail
  - Mean
```
public Mean()
```
- Method Detail
  - add
```
public void add(double value)
```
    Adds a value to the arithmetic mean.
    
    Parameters:
    
    value - the value which should be added to the arithmetic mean.
  - add
```
public void add(double value,
                long count)
```
    Adds a value count times to the arithmetic mean.
    
    Parameters:
    
    value - the value which should be added to the arithmetic mean.
    
    count - number of times the value should be added to arithmetic mean.
  - mean
```
public double mean()
```
    Returns:
    
    Retrieves the mean of all values added with add(double) or 0 if there are zero add values.
  - count
```
public long count()
```
    Returns:
    
    Retrieves the number of times a value was added to the mean.
  - toString
```
public String toString()
```
    Overrides:
    
    toString in class Object
    
    Returns:
    
    A human-readable String representation.