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## weka.associations
Class Apriori

    java.lang.Object
      weka.associations.AbstractAssociator
          weka.associations.Apriori

All Implemented Interfaces:
  java.io.Serializable, java.lang.Cloneable, Associator, CARuleMiner, CapabilitiesHandler, OptionHandler, RevisionHandler, TechnicalInformationHandler

    public class Apriori

extends AbstractAssociator
implements OptionHandler, CARuleMiner, TechnicalInformationHandler

Class implementing an Apriori-type algorithm. Iteratively reduces the minimum support until it finds the required number of rules with the given minimum confidence.
The algorithm has an option to mine class association rules. It is adapted as explained in the second reference.
For more information see:
R. Agrawal, R. Srikant: Fast Algorithms for Mining Association Rules in Large Databases. In: 20th International Conference on Very Large Data Bases, 478-499, 1994.
Bing Liu, Wynne Hsu, Yiming Ma: Integrating Classification and Association Rule Mining. In: Fourth International Conference on Knowledge Discovery and Data Mining, 80-86, 1998.

BibTeX:

     @inproceedings{Agrawal1994,
        author = {R. Agrawal and R. Srikant},
        booktitle = {20th International Conference on Very Large Data Bases},
        pages = {478-499},
        publisher = {Morgan Kaufmann, Los Altos, CA},
        title = {Fast Algorithms for Mining Association Rules in Large Databases},
        year = {1994}
     }

     @inproceedings{Liu1998,
        author = {Bing Liu and Wynne Hsu and Yiming Ma},
        booktitle = {Fourth International Conference on Knowledge Discovery and Data Mining},
        pages = {80-86},
        publisher = {AAAI Press},
        title = {Integrating Classification and Association Rule Mining},
        year = {1998}
     }

Valid options are:

     -N <required number of rules output>
      The required number of rules. (default = 10)

     -T <0=confidence | 1=lift | 2=leverage | 3=Conviction>
      The metric type by which to rank rules. (default = confidence)

     -C <minimum metric score of a rule>
      The minimum confidence of a rule. (default = 0.9)

     -D <delta for minimum support>
      The delta by which the minimum support is decreased in
      each iteration. (default = 0.05)

     -U <upper bound for minimum support>
      Upper bound for minimum support. (default = 1.0)

     -M <lower bound for minimum support>
      The lower bound for the minimum support. (default = 0.1)

     -S <significance level>
      If used, rules are tested for significance at
      the given level. Slower. (default = no significance testing)

     -I
      If set the itemsets found are also output. (default = no)

     -R
      Remove columns that contain all missing values (default = no)

     -V
      Report progress iteratively. (default = no)

     -A
      If set class association rules are mined. (default = no)

     -c <the class index>
      The class index. (default = last)

Version:
  $Revision: 9096 $
Author:
  Eibe Frank (eibe@cs.waikato.ac.nz), Mark Hall (mhall@cs.waikato.ac.nz), Stefan Mutter (mutter@cs.waikato.ac.nz)
See Also:
  Serialized Form

Field Summary
`static Tag[]` | `TAGS_SELECTION` Metric types.

Constructor Summary
`Apriori()` Constructor that allows to sets default values for the minimum confidence and the maximum number of rules the minimum confidence.

Method Summary
`void` | `buildAssociations(Instances instances)` Method that generates all large itemsets with a minimum support, and from these all association rules with a minimum confidence.
`java.lang.String` | `carTipText()` Returns the tip text for this property
`java.lang.String` | `classIndexTipText()` Returns the tip text for this property
`java.lang.String` | `deltaTipText()` Returns the tip text for this property
`FastVector[]` | `getAllTheRules()` returns all the rules
`Capabilities` | `getCapabilities()` Returns default capabilities of the classifier.
`boolean` | `getCar()` Gets whether class association ruels are mined
`int` | `getClassIndex()` Gets the class index
`double` | `getDelta()` Get the value of delta.
`Instances` | `getInstancesNoClass()` Gets the instances without the class atrribute.
`Instances` | `getInstancesOnlyClass()` Gets only the class attribute of the instances.
`double` | `getLowerBoundMinSupport()` Get the value of lowerBoundMinSupport.
`SelectedTag` | `getMetricType()` Get the metric type
`double` | `getMinMetric()` Get the value of minConfidence.
`int` | `getNumRules()` Get the value of numRules.
`java.lang.String[]` | `getOptions()` Gets the current settings of the Apriori object.
`boolean` | `getOutputItemSets()` Gets whether itemsets are output as well
`boolean` | `getRemoveAllMissingCols()` Returns whether columns containing all missing values are to be removed
`java.lang.String` | `getRevision()` Returns the revision string.
`double` | `getSignificanceLevel()` Get the value of significanceLevel.
`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.
`double` | `getUpperBoundMinSupport()` Get the value of upperBoundMinSupport.
`boolean` | `getVerbose()` Gets whether algorithm is run in verbose mode
`java.lang.String` | `globalInfo()` Returns a string describing this associator
`java.util.Enumeration` | `listOptions()` Returns an enumeration describing the available options.
`java.lang.String` | `lowerBoundMinSupportTipText()` Returns the tip text for this property
`static void` | `main(java.lang.String[] args)` Main method.
`java.lang.String` | `metricString()` Returns the metric string for the chosen metric type
`java.lang.String` | `metricTypeTipText()` Returns the tip text for this property
`FastVector[]` | `mineCARs(Instances data)` Method that mines all class association rules with minimum support and with a minimum confidence.
`java.lang.String` | `minMetricTipText()` Returns the tip text for this property
`java.lang.String` | `numRulesTipText()` Returns the tip text for this property
`java.lang.String` | `outputItemSetsTipText()` Returns the tip text for this property
`java.lang.String` | `removeAllMissingColsTipText()` Returns the tip text for this property
`void` | `resetOptions()` Resets the options to the default values.
`void` | `setCar(boolean flag)` Sets class association rule mining
`void` | `setClassIndex(int index)` Sets the class index
`void` | `setDelta(double v)` Set the value of delta.
`void` | `setLowerBoundMinSupport(double v)` Set the value of lowerBoundMinSupport.
`void` | `setMetricType(SelectedTag d)` Set the metric type for ranking rules
`void` | `setMinMetric(double v)` Set the value of minConfidence.
`void` | `setNumRules(int v)` Set the value of numRules.
`void` | `setOptions(java.lang.String[] options)` Parses a given list of options.
`void` | `setOutputItemSets(boolean flag)` Sets whether itemsets are output as well
`void` | `setRemoveAllMissingCols(boolean r)` Remove columns containing all missing values.
`void` | `setSignificanceLevel(double v)` Set the value of significanceLevel.
`void` | `setUpperBoundMinSupport(double v)` Set the value of upperBoundMinSupport.
`void` | `setVerbose(boolean flag)` Sets verbose mode
`java.lang.String` | `significanceLevelTipText()` Returns the tip text for this property
`java.lang.String` | `toString()` Outputs the size of all the generated sets of itemsets and the rules.
`java.lang.String` | `upperBoundMinSupportTipText()` Returns the tip text for this property
`java.lang.String` | `verboseTipText()` Returns the tip text for this property

Methods inherited from class weka.associations.AbstractAssociator
`forName, makeCopies, makeCopy`

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

Field Detail

### TAGS_SELECTION

    public static final Tag[] TAGS_SELECTION

  Metric types.

Constructor Detail

### Apriori

    public Apriori()

  Constructor that allows to sets default values for the minimum confidence and the maximum number of rules the minimum confidence.

Method Detail

### globalInfo

    public java.lang.String globalInfo()

  Returns a string describing this associator

  Returns:
    a description of the evaluator 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

### resetOptions

    public void resetOptions()

  Resets the options to the default values.

### getCapabilities

    public Capabilities getCapabilities()

  Returns default capabilities of the classifier.

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

### buildAssociations

    public void buildAssociations(Instances instances)
                           throws java.lang.Exception

  Method that generates all large itemsets with a minimum support, and from these all association rules with a minimum confidence.

  Specified by:
    `buildAssociations` in interface `Associator`
  Parameters:
    `instances` - the instances to be used for generating the associations
  Throws:
    `java.lang.Exception` - if rules can't be built successfully

### mineCARs

    public FastVector[] mineCARs(Instances data)
                          throws java.lang.Exception

  Method that mines all class association rules with minimum support and with a minimum confidence.

  Specified by:
    `mineCARs` in interface `CARuleMiner`
  Parameters:
    `data` - the instances for which class association rules should be mined
  Returns:
    an sorted array of FastVector (confidence depended) containing the rules and metric information
  Throws:
    `java.lang.Exception` - if rules can't be built successfully

### getInstancesNoClass

    public Instances getInstancesNoClass()

  Gets the instances without the class atrribute.

  Specified by:
    `getInstancesNoClass` in interface `CARuleMiner`
  Returns:
    the instances without the class attribute.

### getInstancesOnlyClass

    public Instances getInstancesOnlyClass()

  Gets only the class attribute of the instances.

  Specified by:
    `getInstancesOnlyClass` in interface `CARuleMiner`
  Returns:
    the class attribute of all instances.

### listOptions

    public java.util.Enumeration listOptions()

  Returns an enumeration describing the available options.

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

### setOptions

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

  Parses a given list of options.

  Valid options are:

       -N <required number of rules output>
        The required number of rules. (default = 10)

       -T <0=confidence | 1=lift | 2=leverage | 3=Conviction>
        The metric type by which to rank rules. (default = confidence)

       -C <minimum metric score of a rule>
        The minimum confidence of a rule. (default = 0.9)

       -D <delta for minimum support>
        The delta by which the minimum support is decreased in
        each iteration. (default = 0.05)

       -U <upper bound for minimum support>
        Upper bound for minimum support. (default = 1.0)

       -M <lower bound for minimum support>
        The lower bound for the minimum support. (default = 0.1)

       -S <significance level>
        If used, rules are tested for significance at
        the given level. Slower. (default = no significance testing)

       -I
        If set the itemsets found are also output. (default = no)

       -R
        Remove columns that contain all missing values (default = no)

       -V
        Report progress iteratively. (default = no)

       -A
        If set class association rules are mined. (default = no)

       -c <the class index>
        The class index. (default = last)

  Specified by:
    `setOptions` in interface `OptionHandler`
  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 Apriori object.

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

### toString

    public java.lang.String toString()

  Outputs the size of all the generated sets of itemsets and the rules.

  Overrides:
    `toString` in class `java.lang.Object`
  Returns:
    a string representation of the model

### metricString

    public java.lang.String metricString()

  Returns the metric string for the chosen metric type

  Specified by:
    `metricString` in interface `CARuleMiner`
  Returns:
    a string describing the used metric for the interestingness of a class association rule

### removeAllMissingColsTipText

    public java.lang.String removeAllMissingColsTipText()

  Returns the tip text for this property

  Returns:
    tip text for this property suitable for displaying in the explorer/experimenter gui

### setRemoveAllMissingCols

    public void setRemoveAllMissingCols(boolean r)

  Remove columns containing all missing values.

  Parameters:
    `r` - true if cols are to be removed.

### getRemoveAllMissingCols

    public boolean getRemoveAllMissingCols()

  Returns whether columns containing all missing values are to be removed

  Returns:
    true if columns are to be removed.

### upperBoundMinSupportTipText

    public java.lang.String upperBoundMinSupportTipText()

  Returns the tip text for this property

  Returns:
    tip text for this property suitable for displaying in the explorer/experimenter gui

### getUpperBoundMinSupport

    public double getUpperBoundMinSupport()

  Get the value of upperBoundMinSupport.

  Returns:
    Value of upperBoundMinSupport.

### setUpperBoundMinSupport

    public void setUpperBoundMinSupport(double v)

  Set the value of upperBoundMinSupport.

  Parameters:
    `v` - Value to assign to upperBoundMinSupport.

### setClassIndex

    public void setClassIndex(int index)

  Sets the class index

  Specified by:
    `setClassIndex` in interface `CARuleMiner`
  Parameters:
    `index` - the class index

### getClassIndex

    public int getClassIndex()

  Gets the class index

  Returns:
    the index of the class attribute

### classIndexTipText

    public java.lang.String classIndexTipText()

  Returns the tip text for this property

  Returns:
    tip text for this property suitable for displaying in the explorer/experimenter gui

### setCar

    public void setCar(boolean flag)

  Sets class association rule mining

  Parameters:
    `flag` - if class association rules are mined, false otherwise

### getCar

    public boolean getCar()

  Gets whether class association ruels are mined

  Returns:
    true if class association rules are mined, false otherwise

### carTipText

    public java.lang.String carTipText()

  Returns the tip text for this property

  Returns:
    tip text for this property suitable for displaying in the explorer/experimenter gui

### lowerBoundMinSupportTipText

    public java.lang.String lowerBoundMinSupportTipText()

  Returns the tip text for this property

  Returns:
    tip text for this property suitable for displaying in the explorer/experimenter gui

### getLowerBoundMinSupport

    public double getLowerBoundMinSupport()

  Get the value of lowerBoundMinSupport.

  Returns:
    Value of lowerBoundMinSupport.

### setLowerBoundMinSupport

    public void setLowerBoundMinSupport(double v)

  Set the value of lowerBoundMinSupport.

  Parameters:
    `v` - Value to assign to lowerBoundMinSupport.

### getMetricType

    public SelectedTag getMetricType()

  Get the metric type

  Returns:
    the type of metric to use for ranking rules

### metricTypeTipText

    public java.lang.String metricTypeTipText()

  Returns the tip text for this property

  Returns:
    tip text for this property suitable for displaying in the explorer/experimenter gui

### setMetricType

    public void setMetricType(SelectedTag d)

  Set the metric type for ranking rules

  Parameters:
    `d` - the type of metric

### minMetricTipText

    public java.lang.String minMetricTipText()

  Returns the tip text for this property

  Returns:
    tip text for this property suitable for displaying in the explorer/experimenter gui

### getMinMetric

    public double getMinMetric()

  Get the value of minConfidence.

  Returns:
    Value of minConfidence.

### setMinMetric

    public void setMinMetric(double v)

  Set the value of minConfidence.

  Parameters:
    `v` - Value to assign to minConfidence.

### numRulesTipText

    public java.lang.String numRulesTipText()

  Returns the tip text for this property

  Returns:
    tip text for this property suitable for displaying in the explorer/experimenter gui

### getNumRules

    public int getNumRules()

  Get the value of numRules.

  Returns:
    Value of numRules.

### setNumRules

    public void setNumRules(int v)

  Set the value of numRules.

  Parameters:
    `v` - Value to assign to numRules.

### deltaTipText

    public java.lang.String deltaTipText()

  Returns the tip text for this property

  Returns:
    tip text for this property suitable for displaying in the explorer/experimenter gui

### getDelta

    public double getDelta()

  Get the value of delta.

  Returns:
    Value of delta.

### setDelta

    public void setDelta(double v)

  Set the value of delta.

  Parameters:
    `v` - Value to assign to delta.

### significanceLevelTipText

    public java.lang.String significanceLevelTipText()

  Returns the tip text for this property

  Returns:
    tip text for this property suitable for displaying in the explorer/experimenter gui

### getSignificanceLevel

    public double getSignificanceLevel()

  Get the value of significanceLevel.

  Returns:
    Value of significanceLevel.

### setSignificanceLevel

    public void setSignificanceLevel(double v)

  Set the value of significanceLevel.

  Parameters:
    `v` - Value to assign to significanceLevel.

### setOutputItemSets

    public void setOutputItemSets(boolean flag)

  Sets whether itemsets are output as well

  Parameters:
    `flag` - true if itemsets are to be output as well

### getOutputItemSets

    public boolean getOutputItemSets()

  Gets whether itemsets are output as well

  Returns:
    true if itemsets are output as well

### outputItemSetsTipText

    public java.lang.String outputItemSetsTipText()

  Returns the tip text for this property

  Returns:
    tip text for this property suitable for displaying in the explorer/experimenter gui

### setVerbose

    public void setVerbose(boolean flag)

  Sets verbose mode

  Parameters:
    `flag` - true if algorithm should be run in verbose mode

### getVerbose

    public boolean getVerbose()

  Gets whether algorithm is run in verbose mode

  Returns:
    true if algorithm is run in verbose mode

### verboseTipText

    public java.lang.String verboseTipText()

  Returns the tip text for this property

  Returns:
    tip text for this property suitable for displaying in the explorer/experimenter gui

### getAllTheRules

    public FastVector[] getAllTheRules()

  returns all the rules

  Returns:
    all the rules
  See Also:
    `m_allTheRules`

### getRevision

    public java.lang.String getRevision()

  Returns the revision string.

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

### main

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

  Main method.

  Parameters:
    `args` - the commandline options

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