magpie.attributes.evaluators

Class SpearmansCorrelationEvaluator

java.lang.Object

magpie.attributes.evaluators.BaseAttributeEvaluator

magpie.attributes.evaluators.SpearmansCorrelationEvaluator

All Implemented Interfaces:

Options

public class SpearmansCorrelationEvaluator
extends BaseAttributeEvaluator

Evaluate attributes based on Spearson's Correlation Coefficient, which is simply the Pearson's Correlation Coefficient between the measured and predicted ranks of entries. This class ranks attributes based on the squared value of the correlation coefficient. So, positive and negative correlations are treated with an equal footing.

Usage: *No options to set*

See Also:

PearsonsCorrelationEvaluator

Constructor Summary

Constructors

Constructor and Description
SpearmansCorrelationEvaluator()

Method Summary

Modifier and Type	Method and Description
protected java.util.Comparator<java.lang.Double>	compare() Create a comparator that will sort entries from the best to worst
protected double[]	evaluateAttributes_internal(Dataset Data) Operation that actually performs the work of evaluating attributes.
java.lang.String	printUsage() Print out required format for options.
void	setOptions(java.util.List<java.lang.Object> Options) Set any options for this object.

Methods inherited from class magpie.attributes.evaluators.BaseAttributeEvaluator

evaluateAttributes, getAttributeRanks, printRankings

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

SpearmansCorrelationEvaluator

public SpearmansCorrelationEvaluator()

Method Detail

setOptions

public void setOptions(java.util.List<java.lang.Object> Options)
                throws java.lang.Exception

Description copied from interface: Options

Set any options for this object. If parsing the options fails, return an Exception with the usage as its message.

Parameters:

Options - Array of options as Objects - can be null

Throws:

java.lang.Exception - if problem with inputs

printUsage

public java.lang.String printUsage()

Description copied from interface: Options

Print out required format for options. For consistency, should start with "Usage: ".

Returns:

Usage for this function

compare

protected java.util.Comparator<java.lang.Double> compare()

Description copied from class: BaseAttributeEvaluator

Create a comparator that will sort entries from the best to worst

Specified by:

compare in class BaseAttributeEvaluator

Returns:

Whether the predictive power of an attribute increases with increasing parameter

evaluateAttributes_internal

protected double[] evaluateAttributes_internal(Dataset Data)

Description copied from class: BaseAttributeEvaluator

Operation that actually performs the work of evaluating attributes.

Specified by:

evaluateAttributes_internal in class BaseAttributeEvaluator

Parameters:

Data - Dataset used to evaluate attributes

Returns:

Predictive power of each attribute.