StratifiedCrossValidation (ELKI: Environment for DeveLoping KDD-Applications Supported by Index-Structures)

java.lang.Object
- elki.evaluation.classification.holdout.AbstractHoldout
- - elki.evaluation.classification.holdout.StratifiedCrossValidation

All Implemented Interfaces:

Holdout
```
public class StratifiedCrossValidation
extends AbstractHoldout
```
A stratified n-fold crossvalidation to distribute the data to n buckets where each bucket exhibits approximately the same distribution of classes as does the complete data set. The buckets are disjoint. The distribution is deterministic.

Since:

0.7.0

Author:

Arthur Zimek

Nested Class Summary

Nested Classes
Modifier and Type Class Description

static class StratifiedCrossValidation.Par
Parameterization class

Field Summary

Fields
Modifier and Type	Field	Description
`protected int[]`	`assignment`	Partition assignment, sizes
`protected int`	`fold`	Holds the number of folds, current fold.
`protected int`	`nfold`	Holds the number of folds, current fold.
`protected int[]`	`sizes`	Partition assignment, sizes

Fields inherited from class elki.evaluation.classification.holdout.AbstractHoldout
bundle, labelcol, labels

Constructor Summary

Constructors
Constructor Description

StratifiedCrossValidation(int nfold)
Provides a stratified crossvalidation.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`initialize(MultipleObjectsBundle bundle)`	Initialize the holdout procedure for a data set.
`TrainingAndTestSet`	`nextPartitioning()`	Get the next partitioning of the given holdout.
`int`	`numberOfPartitions()`	How many partitions to test.

Methods inherited from class elki.evaluation.classification.holdout.AbstractHoldout
allClassLabels, allClassLabels, findClassLabelColumn, getLabels

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

- Field Detail
  - nfold
```
protected int nfold
```
    Holds the number of folds, current fold.
  - fold
```
protected int fold
```
    Holds the number of folds, current fold.
  - assignment
```
protected int[] assignment
```
    Partition assignment, sizes
  - sizes
```
protected int[] sizes
```
    Partition assignment, sizes
- Constructor Detail
  - StratifiedCrossValidation
```
public StratifiedCrossValidation(int nfold)
```
    Provides a stratified crossvalidation. Setting parameter N_P to the OptionHandler.
- Method Detail
  - numberOfPartitions
```
public int numberOfPartitions()
```
    Description copied from interface: Holdout
    
    How many partitions to test.
    
    Returns:
    
    Number of partitions.
  - initialize
```
public void initialize(MultipleObjectsBundle bundle)
```
    Description copied from interface: Holdout
    
    Initialize the holdout procedure for a data set.
    
    Specified by:
    
    initialize in interface Holdout
    
    Overrides:
    
    initialize in class AbstractHoldout
    
    Parameters:
    
    bundle - Data set bundle
  - nextPartitioning
```
public TrainingAndTestSet nextPartitioning()
```
    Description copied from interface: Holdout
    
    Get the next partitioning of the given holdout.
    
    Returns:
    
    Next partitioning of the data set