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## weka.attributeSelection
Class ConsistencySubsetEval

    java.lang.Object
      weka.attributeSelection.ASEvaluation
          weka.attributeSelection.ConsistencySubsetEval

All Implemented Interfaces:
  java.io.Serializable, SubsetEvaluator, CapabilitiesHandler, RevisionHandler, TechnicalInformationHandler

    public class ConsistencySubsetEval

extends ASEvaluation
implements SubsetEvaluator, TechnicalInformationHandler

ConsistencySubsetEval :
Evaluates the worth of a subset of attributes by the level of consistency in the class values when the training instances are projected onto the subset of attributes.
Consistency of any subset can never be lower than that of the full set of attributes, hence the usual practice is to use this subset evaluator in conjunction with a Random or Exhaustive search which looks for the smallest subset with consistency equal to that of the full set of attributes.
For more information see:
H. Liu, R. Setiono: A probabilistic approach to feature selection - A filter solution. In: 13th International Conference on Machine Learning, 319-327, 1996.

BibTeX:

     @inproceedings{Liu1996,
        author = {H. Liu and R. Setiono},
        booktitle = {13th International Conference on Machine Learning},
        pages = {319-327},
        title = {A probabilistic approach to feature selection - A filter solution},
        year = {1996}
     }

Version:
  $Revision: 5511 $
Author:
  Mark Hall (mhall@cs.waikato.ac.nz)
See Also:
  `Discretize`, Serialized Form

Nested Class Summary
`class` | `ConsistencySubsetEval.hashKey` Class providing keys to the hash table.

Constructor Summary
`ConsistencySubsetEval()` Constructor.

Method Summary
`void` | `buildEvaluator(Instances data)` Generates a attribute evaluator.
`double` | `evaluateSubset(java.util.BitSet subset)` Evaluates a subset of attributes
`Capabilities` | `getCapabilities()` Returns the capabilities of this evaluator.
`java.lang.String` | `getRevision()` Returns the revision string.
`TechnicalInformation` | `getTechnicalInformation()` Returns an instance of a TechnicalInformation object, containing detailed information about the technical background of this class, e.g., paper reference or book this class is based on.
`java.lang.String` | `globalInfo()` Returns a string describing this search method
`static void` | `main(java.lang.String[] args)` Main method for testing this class.
`java.lang.String` | `toString()` returns a description of the evaluator

Methods inherited from class weka.attributeSelection.ASEvaluation
`forName, makeCopies, postProcess`

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

Constructor Detail

### ConsistencySubsetEval

    public ConsistencySubsetEval()

  Constructor. Calls restOptions to set default options

Method Detail

### globalInfo

    public java.lang.String globalInfo()

  Returns a string describing this search method

  Returns:
    a description of the search suitable for displaying in the explorer/experimenter gui

### getTechnicalInformation

    public TechnicalInformation getTechnicalInformation()

  Returns an instance of a TechnicalInformation object, containing detailed information about the technical background of this class, e.g., paper reference or book this class is based on.

  Specified by:
    `getTechnicalInformation` in interface `TechnicalInformationHandler`
  Returns:
    the technical information about this class

### getCapabilities

    public Capabilities getCapabilities()

  Returns the capabilities of this evaluator.

  Specified by:
    `getCapabilities` in interface `CapabilitiesHandler`
  Overrides:
    `getCapabilities` in class `ASEvaluation`
  Returns:
    the capabilities of this evaluator
  See Also:
    `Capabilities`

### buildEvaluator

    public void buildEvaluator(Instances data)
                        throws java.lang.Exception

  Generates a attribute evaluator. Has to initialize all fields of the evaluator that are not being set via options.

  Specified by:
    `buildEvaluator` in class `ASEvaluation`
  Parameters:
    `data` - set of instances serving as training data
  Throws:
    `java.lang.Exception` - if the evaluator has not been generated successfully

### evaluateSubset

    public double evaluateSubset(java.util.BitSet subset)
                          throws java.lang.Exception

  Evaluates a subset of attributes

  Specified by:
    `evaluateSubset` in interface `SubsetEvaluator`
  Parameters:
    `subset` - a bitset representing the attribute subset to be evaluated
  Returns:
    the "merit" of the subset
  Throws:
    `java.lang.Exception` - if the subset could not be evaluated

### toString

    public java.lang.String toString()

  returns a description of the evaluator

  Overrides:
    `toString` in class `java.lang.Object`
  Returns:
    a description of the evaluator as a String.

### getRevision

    public java.lang.String getRevision()

  Returns the revision string.

  Specified by:
    `getRevision` in interface `RevisionHandler`
  Overrides:
    `getRevision` in class `ASEvaluation`
  Returns:
    the revision

### main

    public static void main(java.lang.String[] args)

  Main method for testing this class.

  Parameters:
    `args` - the options

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