ConfusionMatrix (Mallet 2 API)

java.lang.Object
- cc.mallet.classify.evaluate.ConfusionMatrix

```
public class ConfusionMatrix
extends java.lang.Object
```
Calculates and prints confusion matrix, accuracy, and precision for a given clasification trial.

Constructor Summary

Constructors
Constructor Description

ConfusionMatrix(Trial t)
Constructs matrix and calculates values

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`double`	`getClassPrior(int classIndex)`	Returns the percentage of instances with true label = classIndex
`double`	`getConfusionBetween(int class1, int class2)`	Returns percent of time that class2 is true class when class1 is predicted class
`double`	`getPrecision(int predictedClassIndex)`	Returns the precision of this predicted class
`java.lang.String`	`toString()`

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

- Constructor Detail
  - ConfusionMatrix
```
public ConfusionMatrix(Trial t)
```
    Constructs matrix and calculates values
    
    Parameters:
    
    t - the trial to build matrix from
- Method Detail
  - toString
```
public java.lang.String toString()
```
    Overrides:
    
    toString in class java.lang.Object
  - getPrecision
```
public double getPrecision(int predictedClassIndex)
```
    Returns the precision of this predicted class
  - getConfusionBetween
```
public double getConfusionBetween(int class1,
                                  int class2)
```
    Returns percent of time that class2 is true class when class1 is predicted class
  - getClassPrior
```
public double getClassPrior(int classIndex)
```
    Returns the percentage of instances with true label = classIndex