Package weka.attributeSelection
Class ChiSquaredAttributeEval
java.lang.Object
weka.attributeSelection.ASEvaluation
weka.attributeSelection.ChiSquaredAttributeEval
- All Implemented Interfaces:
Serializable
,AttributeEvaluator
,CapabilitiesHandler
,OptionHandler
,RevisionHandler
public class ChiSquaredAttributeEval
extends ASEvaluation
implements AttributeEvaluator, OptionHandler
ChiSquaredAttributeEval :
Evaluates the worth of an attribute by computing the value of the chi-squared statistic with respect to the class.
Valid options are:
Evaluates the worth of an attribute by computing the value of the chi-squared statistic with respect to the class.
Valid options are:
-M treat missing values as a seperate value.
-B just binarize numeric attributes instead of properly discretizing them.
- Version:
- $Revision: 5511 $
- Author:
- Eibe Frank (eibe@cs.waikato.ac.nz)
- See Also:
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionReturns the tip text for this propertyvoid
buildEvaluator
(Instances data) Initializes a chi-squared attribute evaluator.double
evaluateAttribute
(int attribute) evaluates an individual attribute by measuring its chi-squared value.boolean
get whether numeric attributes are just being binarized.Returns the capabilities of this evaluator.boolean
get whether missing values are being distributed or notString[]
Gets the current settings.Returns the revision string.Returns a string describing this attribute evaluatorReturns an enumeration describing the available optionsstatic void
Main method.Returns the tip text for this propertyvoid
setBinarizeNumericAttributes
(boolean b) Binarize numeric attributes.void
setMissingMerge
(boolean b) distribute the counts for missing values across observed valuesvoid
setOptions
(String[] options) Parses a given list of options.toString()
Describe the attribute evaluatorMethods inherited from class weka.attributeSelection.ASEvaluation
clean, forName, makeCopies, postProcess
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Constructor Details
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ChiSquaredAttributeEval
public ChiSquaredAttributeEval()Constructor
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Method Details
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globalInfo
Returns a string describing this attribute evaluator- Returns:
- a description of the evaluator suitable for displaying in the explorer/experimenter gui
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listOptions
Returns an enumeration describing the available options- Specified by:
listOptions
in interfaceOptionHandler
- Returns:
- an enumeration of all the available options
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setOptions
Parses a given list of options. Valid options are:-M treat missing values as a seperate value.
-B just binarize numeric attributes instead of properly discretizing them.
- Specified by:
setOptions
in interfaceOptionHandler
- Parameters:
options
- the list of options as an array of strings- Throws:
Exception
- if an option is not supported
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getOptions
Gets the current settings.- Specified by:
getOptions
in interfaceOptionHandler
- Returns:
- an array of strings suitable for passing to setOptions()
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binarizeNumericAttributesTipText
Returns the tip text for this property- Returns:
- tip text for this property suitable for displaying in the explorer/experimenter gui
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setBinarizeNumericAttributes
public void setBinarizeNumericAttributes(boolean b) Binarize numeric attributes.- Parameters:
b
- true=binarize numeric attributes
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getBinarizeNumericAttributes
public boolean getBinarizeNumericAttributes()get whether numeric attributes are just being binarized.- Returns:
- true if missing values are being distributed.
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missingMergeTipText
Returns the tip text for this property- Returns:
- tip text for this property suitable for displaying in the explorer/experimenter gui
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setMissingMerge
public void setMissingMerge(boolean b) distribute the counts for missing values across observed values- Parameters:
b
- true=distribute missing values.
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getMissingMerge
public boolean getMissingMerge()get whether missing values are being distributed or not- Returns:
- true if missing values are being distributed.
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getCapabilities
Returns the capabilities of this evaluator.- Specified by:
getCapabilities
in interfaceCapabilitiesHandler
- Overrides:
getCapabilities
in classASEvaluation
- Returns:
- the capabilities of this evaluator
- See Also:
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buildEvaluator
Initializes a chi-squared attribute evaluator. Discretizes all attributes that are numeric.- Specified by:
buildEvaluator
in classASEvaluation
- Parameters:
data
- set of instances serving as training data- Throws:
Exception
- if the evaluator has not been generated successfully
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evaluateAttribute
evaluates an individual attribute by measuring its chi-squared value.- Specified by:
evaluateAttribute
in interfaceAttributeEvaluator
- Parameters:
attribute
- the index of the attribute to be evaluated- Returns:
- the chi-squared value
- Throws:
Exception
- if the attribute could not be evaluated
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toString
Describe the attribute evaluator -
getRevision
Returns the revision string.- Specified by:
getRevision
in interfaceRevisionHandler
- Overrides:
getRevision
in classASEvaluation
- Returns:
- the revision
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main
Main method.- Parameters:
args
- the options
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