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## weka.classifiers.rules
Class DTNB

    java.lang.Object
      weka.classifiers.Classifier
          weka.classifiers.rules.DecisionTable
              weka.classifiers.rules.DTNB

All Implemented Interfaces:
  java.io.Serializable, java.lang.Cloneable, AdditionalMeasureProducer, CapabilitiesHandler, OptionHandler, RevisionHandler, TechnicalInformationHandler, WeightedInstancesHandler

    public class DTNB

extends DecisionTable

Class for building and using a decision table/naive bayes hybrid classifier. At each point in the search, the algorithm evaluates the merit of dividing the attributes into two disjoint subsets: one for the decision table, the other for naive Bayes. A forward selection search is used, where at each step, selected attributes are modeled by naive Bayes and the remainder by the decision table, and all attributes are modelled by the decision table initially. At each step, the algorithm also considers dropping an attribute entirely from the model.
For more information, see:
Mark Hall, Eibe Frank: Combining Naive Bayes and Decision Tables. In: Proceedings of the 21st Florida Artificial Intelligence Society Conference (FLAIRS), ???-???, 2008.

BibTeX:

     @inproceedings{Hall2008,
        author = {Mark Hall and Eibe Frank},
        booktitle = {Proceedings of the 21st Florida Artificial Intelligence Society Conference (FLAIRS)},
        pages = {318-319},
        publisher = {AAAI press},
        title = {Combining Naive Bayes and Decision Tables},
        year = {2008}
     }

Valid options are:

     -X <number of folds>
      Use cross validation to evaluate features.
      Use number of folds = 1 for leave one out CV.
      (Default = leave one out CV)

     -E <acc | rmse | mae | auc>
      Performance evaluation measure to use for selecting attributes.
      (Default = accuracy for discrete class and rmse for numeric class)

     -I
      Use nearest neighbour instead of global table majority.

     -R
      Display decision table rules.

Version:
  $Revision: 6269 $
Author:
  Mark Hall (mhall{[at]}pentaho{[dot]}org), Eibe Frank (eibe{[at]}cs{[dot]}waikato{[dot]}ac{[dot]}nz)
See Also:
  Serialized Form

Field Summary

Fields inherited from class weka.classifiers.rules.DecisionTable
`EVAL_ACCURACY, EVAL_AUC, EVAL_DEFAULT, EVAL_MAE, EVAL_RMSE, TAGS_EVALUATION`

Constructor Summary
`DTNB()`

Method Summary
`void` | `buildClassifier(Instances data)` Generates the classifier.
`double[]` | `distributionForInstance(Instance instance)` Calculates the class membership probabilities for the given test instance.
`java.util.Enumeration` | `enumerateMeasures()` Returns an enumeration of the additional measure names
`Capabilities` | `getCapabilities()` Returns default capabilities of the classifier.
`double` | `getMeasure(java.lang.String additionalMeasureName)` Returns the value of the named measure
`java.lang.String[]` | `getOptions()` Gets the current settings of the classifier.
`java.lang.String` | `getRevision()` Returns the revision string.
`ASSearch` | `getSearch()` Gets the current search method
`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 classifier
`java.util.Enumeration` | `listOptions()` Returns an enumeration describing the available options.
`static void` | `main(java.lang.String[] argv)` Main method for testing this class.
`double` | `measurePercentAttsUsedByDT()` Returns the number of rules
`void` | `setOptions(java.lang.String[] options)` Parses the options for this object.
`void` | `setSearch(ASSearch search)` Sets the search method to use
`java.lang.String` | `toString()` Returns a description of the classifier.

Methods inherited from class weka.classifiers.rules.DecisionTable
`crossValTipText, displayRulesTipText, evaluationMeasureTipText, getCrossVal, getDisplayRules, getEvaluationMeasure, getUseIBk, measureNumRules, printFeatures, searchTipText, setCrossVal, setDisplayRules, setEvaluationMeasure, setUseIBk, useIBkTipText`

Methods inherited from class weka.classifiers.Classifier
`classifyInstance, debugTipText, forName, getDebug, makeCopies, makeCopy, setDebug`

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

Constructor Detail

### DTNB

    public DTNB()

Method Detail

### globalInfo

    public java.lang.String globalInfo()

  Returns a string describing classifier

  Overrides:
    `globalInfo` in class `DecisionTable`
  Returns:
    a description 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`
  Overrides:
    `getTechnicalInformation` in class `DecisionTable`
  Returns:
    the technical information about this class

### buildClassifier

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

  Generates the classifier.

  Overrides:
    `buildClassifier` in class `DecisionTable`
  Parameters:
    `data` - set of instances serving as training data
  Throws:
    `java.lang.Exception` - if the classifier has not been generated successfully

### distributionForInstance

    public double[] distributionForInstance(Instance instance)
                                     throws java.lang.Exception

  Calculates the class membership probabilities for the given test instance.

  Overrides:
    `distributionForInstance` in class `DecisionTable`
  Parameters:
    `instance` - the instance to be classified
  Returns:
    predicted class probability distribution
  Throws:
    `java.lang.Exception` - if distribution can't be computed

### toString

    public java.lang.String toString()

  Description copied from class: `DecisionTable`
  Returns a description of the classifier.

  Overrides:
    `toString` in class `DecisionTable`
  Returns:
    a description of the classifier as a string.

### measurePercentAttsUsedByDT

    public double measurePercentAttsUsedByDT()

  Returns the number of rules

  Returns:
    the number of rules

### enumerateMeasures

    public java.util.Enumeration enumerateMeasures()

  Returns an enumeration of the additional measure names

  Specified by:
    `enumerateMeasures` in interface `AdditionalMeasureProducer`
  Overrides:
    `enumerateMeasures` in class `DecisionTable`
  Returns:
    an enumeration of the measure names

### getMeasure

    public double getMeasure(java.lang.String additionalMeasureName)

  Returns the value of the named measure

  Specified by:
    `getMeasure` in interface `AdditionalMeasureProducer`
  Overrides:
    `getMeasure` in class `DecisionTable`
  Parameters:
    `additionalMeasureName` - the name of the measure to query for its value
  Returns:
    the value of the named measure
  Throws:
    `java.lang.IllegalArgumentException` - if the named measure is not supported

### getCapabilities

    public Capabilities getCapabilities()

  Returns default capabilities of the classifier.

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

### setSearch

    public void setSearch(ASSearch search)

  Sets the search method to use

  Overrides:
    `setSearch` in class `DecisionTable`
  Parameters:
    `search` -

### getSearch

    public ASSearch getSearch()

  Gets the current search method

  Overrides:
    `getSearch` in class `DecisionTable`
  Returns:
    the search method used

### listOptions

    public java.util.Enumeration listOptions()

  Returns an enumeration describing the available options.

  Specified by:
    `listOptions` in interface `OptionHandler`
  Overrides:
    `listOptions` in class `DecisionTable`
  Returns:
    an enumeration of all the available options.

### setOptions

    public void setOptions(java.lang.String[] options)
                    throws java.lang.Exception

  Parses the options for this object.

  Valid options are:

       -X <number of folds>
        Use cross validation to evaluate features.
        Use number of folds = 1 for leave one out CV.
        (Default = leave one out CV)

       -E <acc | rmse | mae | auc>
        Performance evaluation measure to use for selecting attributes.
        (Default = accuracy for discrete class and rmse for numeric class)

       -I
        Use nearest neighbour instead of global table majority.

       -R
        Display decision table rules.

  Specified by:
    `setOptions` in interface `OptionHandler`
  Overrides:
    `setOptions` in class `DecisionTable`
  Parameters:
    `options` - the list of options as an array of strings
  Throws:
    `java.lang.Exception` - if an option is not supported

### getOptions

    public java.lang.String[] getOptions()

  Gets the current settings of the classifier.

  Specified by:
    `getOptions` in interface `OptionHandler`
  Overrides:
    `getOptions` in class `DecisionTable`
  Returns:
    an array of strings suitable for passing to setOptions

### getRevision

    public java.lang.String getRevision()

  Returns the revision string.

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

### main

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

  Main method for testing this class.

  Parameters:
    `argv` - the command-line options

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