java.lang.Object
- weka.filters.Filter
- - weka.filters.supervised.attribute.NominalToBinary

All Implemented Interfaces:

java.io.Serializable, CapabilitiesHandler, CapabilitiesIgnorer, CommandlineRunnable, OptionHandler, RevisionHandler, TechnicalInformationHandler, WeightedAttributesHandler, WeightedInstancesHandler, SupervisedFilter
```
public class NominalToBinary
extends Filter
implements SupervisedFilter, OptionHandler, TechnicalInformationHandler, WeightedAttributesHandler, WeightedInstancesHandler
```
Converts all nominal attributes into binary numeric attributes. An attribute with k values is transformed into k binary attributes if the class is nominal (using the one-attribute-per-value approach). Binary attributes are left binary if option '-A' is not given. If the class is numeric, k - 1 new binary attributes are generated in the manner described in "Classification and Regression Trees" by Breiman et al. (i.e. by taking the average class value associated with each attribute value into account)

For more information, see:

L. Breiman, J.H. Friedman, R.A. Olshen, C.J. Stone (1984). Classification and Regression Trees. Wadsworth Inc.
BibTeX:
```
 @book{Breiman1984,
    author = {L. Breiman and J.H. Friedman and R.A. Olshen and C.J. Stone},
    publisher = {Wadsworth Inc},
    title = {Classification and Regression Trees},
    year = {1984},
    ISBN = {0412048418}
 }
 
```
Valid options are:
```
 -N
  Sets if binary attributes are to be coded as nominal ones.
 
```
```
 -A
  For each nominal value a new attribute is created, 
  not only if there are more than 2 values.
 
```
```
-spread-attribute-weight
  When generating binary attributes, spread weight of old
  attribute across new attributes. Do not give each new attribute the old weight.
```
Version:

$Revision: 14534 $

Author:

Eibe Frank (eibe@cs.waikato.ac.nz)

See Also:

Serialized Form

Constructor Summary

Constructors
Constructor Description

NominalToBinary()

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`boolean`	`batchFinished()`	Signify that this batch of input to the filter is finished.
`java.lang.String`	`binaryAttributesNominalTipText()`	Returns the tip text for this property
`boolean`	`getBinaryAttributesNominal()`	Gets if binary attributes are to be treated as nominal ones.
`Capabilities`	`getCapabilities()`	Returns the Capabilities of this filter.
`java.lang.String[]`	`getOptions()`	Gets the current settings of the filter.
`java.lang.String`	`getRevision()`	Returns the revision string.
`boolean`	`getSpreadAttributeWeight()`	If true, when generating binary attributes, spread weight of old attribute across new attributes.
`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.
`boolean`	`getTransformAllValues()`	Gets if all nominal values are turned into new attributes, not only if there are more than 2.
`java.lang.String`	`globalInfo()`	Returns a string describing this filter
`boolean`	`input(Instance instance)`	Input an instance for filtering.
`java.util.Enumeration<Option>`	`listOptions()`	Returns an enumeration describing the available options.
`static void`	`main(java.lang.String[] argv)`	Main method for testing this class.
`void`	`setBinaryAttributesNominal(boolean bool)`	Sets if binary attributes are to be treates as nominal ones.
`boolean`	`setInputFormat(Instances instanceInfo)`	Sets the format of the input instances.
`void`	`setOptions(java.lang.String[] options)`	Parses a given list of options.
`void`	`setSpreadAttributeWeight(boolean p)`	If true, when generating binary attributes, spread weight of old attribute across new attributes.
`void`	`setTransformAllValues(boolean bool)`	Sets whether all nominal values are transformed into new attributes, not just if there are more than 2.
`java.lang.String`	`spreadAttributeWeightTipText()`	Returns the tip text for this property
`java.lang.String`	`transformAllValuesTipText()`	Returns the tip text for this property

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

- Constructor Detail
  - NominalToBinary
```
public NominalToBinary()
```
- Method Detail
  - globalInfo
```
public java.lang.String globalInfo()
```
    Returns a string describing this filter
    
    Returns:
    
    a description of the filter 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 filter.
    
    Specified by:
    
    getCapabilities in interface CapabilitiesHandler
    
    Overrides:
    
    getCapabilities in class Filter
    
    Returns:
    
    the capabilities of this object
    
    See Also:
    
    Capabilities
  - setInputFormat
```
public boolean setInputFormat(Instances instanceInfo)
                       throws java.lang.Exception
```
    Sets the format of the input instances.
    
    Overrides:
    
    setInputFormat in class Filter
    
    Parameters:
    
    instanceInfo - an Instances object containing the input instance structure (any instances contained in the object are ignored - only the structure is required).
    
    Returns:
    
    true if the outputFormat may be collected immediately
    
    Throws:
    
    java.lang.Exception - if the input format can't be set successfully
  - input
```
public boolean input(Instance instance)
```
    Input an instance for filtering. Filter requires all training instances be read before producing output.
    
    Overrides:
    
    input in class Filter
    
    Parameters:
    
    instance - the input instance
    
    Returns:
    
    true if the filtered instance may now be collected with output().
    
    Throws:
    
    java.lang.IllegalStateException - if no input format has been set
  - batchFinished
```
public boolean batchFinished()
```
    Signify that this batch of input to the filter is finished. If the filter requires all instances prior to filtering, output() may now be called to retrieve the filtered instances.
    
    Overrides:
    
    batchFinished in class Filter
    
    Returns:
    
    true if there are instances pending output
    
    Throws:
    
    java.lang.IllegalStateException - if no input structure has been defined
  - listOptions
```
public java.util.Enumeration<Option> listOptions()
```
    Returns an enumeration describing the available options.
    
    Specified by:
    
    listOptions in interface OptionHandler
    
    Overrides:
    
    listOptions in class Filter
    
    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 Sets if binary attributes are to be coded as nominal ones.
    
    -A For each nominal value a new attribute is created, not only if there are more than 2 values.
    
    -spread-attribute-weight When generating binary attributes, spread weight of old attribute across new attributes. Do not give each new attribute the old weight.
    Specified by:
    
    setOptions in interface OptionHandler
    
    Overrides:
    
    setOptions in class Filter
    
    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 filter.
    
    Specified by:
    
    getOptions in interface OptionHandler
    
    Overrides:
    
    getOptions in class Filter
    
    Returns:
    
    an array of strings suitable for passing to setOptions
  - spreadAttributeWeightTipText
```
public java.lang.String spreadAttributeWeightTipText()
```
    Returns the tip text for this property
    
    Returns:
    
    tip text for this property suitable for displaying in the explorer/experimenter gui
  - setSpreadAttributeWeight
```
public void setSpreadAttributeWeight(boolean p)
```
    If true, when generating binary attributes, spread weight of old attribute across new attributes. Do not give each new attribute the old weight.
    
    Parameters:
    
    p - whether weight is spread
  - getSpreadAttributeWeight
```
public boolean getSpreadAttributeWeight()
```
    If true, when generating binary attributes, spread weight of old attribute across new attributes. Do not give each new attribute the old weight.
    
    Returns:
    
    whether weight is spread
  - binaryAttributesNominalTipText
```
public java.lang.String binaryAttributesNominalTipText()
```
    Returns the tip text for this property
    
    Returns:
    
    tip text for this property suitable for displaying in the explorer/experimenter gui
  - getBinaryAttributesNominal
```
public boolean getBinaryAttributesNominal()
```
    Gets if binary attributes are to be treated as nominal ones.
    
    Returns:
    
    true if binary attributes are to be treated as nominal ones
  - setBinaryAttributesNominal
```
public void setBinaryAttributesNominal(boolean bool)
```
    Sets if binary attributes are to be treates as nominal ones.
    
    Parameters:
    
    bool - true if binary attributes are to be treated as nominal ones
  - transformAllValuesTipText
```
public java.lang.String transformAllValuesTipText()
```
    Returns the tip text for this property
    
    Returns:
    
    tip text for this property suitable for displaying in the explorer/experimenter gui
  - getTransformAllValues
```
public boolean getTransformAllValues()
```
    Gets if all nominal values are turned into new attributes, not only if there are more than 2.
    
    Returns:
    
    true all nominal values are transformed into new attributes
  - setTransformAllValues
```
public void setTransformAllValues(boolean bool)
```
    Sets whether all nominal values are transformed into new attributes, not just if there are more than 2.
    
    Parameters:
    
    bool - true if all nominal value are transformed into new attributes
  - getRevision
```
public java.lang.String getRevision()
```
    Returns the revision string.
    
    Specified by:
    
    getRevision in interface RevisionHandler
    
    Overrides:
    
    getRevision in class Filter
    
    Returns:
    
    the revision
  - main
```
public static void main(java.lang.String[] argv)
```
    Main method for testing this class.
    
    Parameters:
    
    argv - should contain arguments to the filter: use -h for help

Class NominalToBinary

Constructor Summary

Method Summary

Methods inherited from class weka.filters.Filter

Methods inherited from class java.lang.Object

Constructor Detail

NominalToBinary

Method Detail

globalInfo

getTechnicalInformation

getCapabilities

setInputFormat

input

batchFinished

listOptions

setOptions

getOptions

spreadAttributeWeightTipText

setSpreadAttributeWeight

getSpreadAttributeWeight

binaryAttributesNominalTipText

getBinaryAttributesNominal

setBinaryAttributesNominal

transformAllValuesTipText

getTransformAllValues

setTransformAllValues

getRevision

main