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/*
* File: ConfusionMatrixConfidenceInterval.java
* Authors: Kevin R. Dixon
* Company: Sandia National Laboratories
* Project: Cognitive Foundry
*
* Copyright September 24, 2007, Sandia Corporation. Under the terms of Contract
* DE-AC04-94AL85000, there is a non-exclusive license for use of this work by
* or on behalf of the U.S. Government. Export of this program may require a
* license from the United States Government. See CopyrightHistory.txt for
* complete details.
*
*/
package gov.sandia.cognition.learning.performance.categorization;
import gov.sandia.cognition.learning.performance.categorization.DefaultBinaryConfusionMatrix;
import gov.sandia.cognition.statistics.method.ConfidenceInterval;
import gov.sandia.cognition.statistics.method.StudentTConfidence;
import gov.sandia.cognition.util.AbstractCloneableSerializable;
import gov.sandia.cognition.util.Summarizer;
import java.util.ArrayList;
import java.util.Collection;
/**
* Puts Student-t ConfidenceIntervals on each entry of the ConfusionMatrix
*
* @author Kevin R. Dixon
* @since 2.0
*
*/
public class DefaultBinaryConfusionMatrixConfidenceInterval
{
/**
* Confidence that the statistic is within the bound, or 1-alpha, on the
* interval [0,1], where confidence=0 means definitely not within the bound
* and confidence=1 means definitely within the bound.
*/
private double confidence;
/**
* The fraction of target falses incorrectly classified as false,
* FalseNegatives / TotalPositives = 1 - TruePositivesRate
*/
private ConfidenceInterval falseNegativesRate;
/**
* The fraction of target falses incorrectly classified as true,
* FalsePositives / TotalNegatives = 1 - TrueNegativesRate
*/
private ConfidenceInterval falsePositivesRate;
/**
* The fraction of target trues that were correctly classified as true,
* TruePositives / TotalPositives = TruePositives / (TruePositives + FalseNegatives)
*/
private ConfidenceInterval truePositivesRate;
/**
* The fraction of negative targets correctly classified as false,
* TrueNegatives / TotalNegatives = TrueNegatives / (TrueNegatives + FalsePositives)
*/
private ConfidenceInterval trueNegativesRate;
/**
* Creates a new instance of ConfusionMatrixConfidenceInterval
* @param confidence
* Confidence that the statistic is within the bound, or 1-alpha, on the
* interval [0,1], where confidence=0 means definitely not within the bound
* and confidence=1 means definitely within the bound.
* @param falsePositivesRate
* The fraction of target falses incorrectly classified as true,
* FalsePositives / TotalNegatives = 1 - TrueNegativesRate
* @param falseNegativesRate
* The fraction of target falses incorrectly classified as false,
* FalseNegatives / TotalPositives = 1 - TruePositivesRate
* @param truePositivesRate
* The fraction of target trues that were correctly classified as true,
* TruePositives / TotalPositives = TruePositives / (TruePositives + FalseNegatives)
* @param trueNegativesRate
* The fraction of negative targets correctly classified as false,
* TrueNegatives / TotalNegatives = TrueNegatives / (TrueNegatives + FalsePositives)
*/
public DefaultBinaryConfusionMatrixConfidenceInterval(
final double confidence,
final ConfidenceInterval falsePositivesRate,
final ConfidenceInterval falseNegativesRate,
final ConfidenceInterval truePositivesRate,
final ConfidenceInterval trueNegativesRate )
{
this.setConfidence( confidence );
this.setFalseNegativesRate( falseNegativesRate );
this.setFalsePositivesRate( falsePositivesRate );
this.setTruePositivesRate( truePositivesRate );
this.setTrueNegativesRate( trueNegativesRate );
}
/**
* Getter for falsePositivesRate
* @return
* The fraction of target falses incorrectly classified as true,
* FalsePositives / TotalNegatives = 1 - TrueNegativesRate
*/
public ConfidenceInterval getFalsePositivesRate()
{
return this.falsePositivesRate;
}
/**
* Setter for falsePositivesRate
* @param falsePositivesRate
* The fraction of target falses incorrectly classified as true,
* FalsePositives / TotalNegatives = 1 - TrueNegativesRate
*/
protected void setFalsePositivesRate(
ConfidenceInterval falsePositivesRate)
{
this.falsePositivesRate = falsePositivesRate;
}
/**
* Getter for falseNegativesRate
* @return
* The fraction of target falses incorrectly classified as false,
* FalseNegatives / TotalPositives = 1 - TruePositivesRate
*/
public ConfidenceInterval getFalseNegativesRate()
{
return this.falseNegativesRate;
}
/**
* Setter for falseNegativesRate
* @param falseNegativesRate
* The fraction of target falses incorrectly classified as false,
* FalseNegatives / TotalPositives = 1 - TruePositivesRate
*/
protected void setFalseNegativesRate(
ConfidenceInterval falseNegativesRate)
{
this.falseNegativesRate = falseNegativesRate;
}
/**
* Getter for truePositivesRate
* @return
* The fraction of target trues that were correctly classified as true,
* TruePositives / TotalPositives = TruePositives / (TruePositives + FalseNegatives)
*/
public ConfidenceInterval getTruePositivesRate()
{
return this.truePositivesRate;
}
/**
* Setter for truePositivesRate
* @param truePositivesRate
* The fraction of target trues that were correctly classified as true,
* TruePositives / TotalPositives = TruePositives / (TruePositives + FalseNegatives)
*/
protected void setTruePositivesRate(
ConfidenceInterval truePositivesRate)
{
this.truePositivesRate = truePositivesRate;
}
/**
* Getter for trueNegativesRate
* @return
* The fraction of negative targets correctly classified as false,
* TrueNegatives / TotalNegatives = TrueNegatives / (TrueNegatives + FalsePositives)
*/
public ConfidenceInterval getTrueNegativesRate()
{
return this.trueNegativesRate;
}
/**
* Setter for trueNegativesRate
* @param trueNegativesRate
* The fraction of negative targets correctly classified as false,
* TrueNegatives / TotalNegatives = TrueNegatives / (TrueNegatives + FalsePositives)
*/
protected void setTrueNegativesRate(
ConfidenceInterval trueNegativesRate)
{
this.trueNegativesRate = trueNegativesRate;
}
/**
* Getter for confidence
* @return
* Confidence that the statistic is within the bound, or 1-alpha, on the
* interval [0,1], where confidence=0 means definitely not within the bound
* and confidence=1 means definitely within the bound.
*/
public double getConfidence()
{
return this.confidence;
}
/**
* Setter for confidence
* @param confidence
* Confidence that the statistic is within the bound, or 1-alpha, on the
* interval [0,1], where confidence=0 means definitely not within the bound
* and confidence=1 means definitely within the bound.
*/
protected void setConfidence(
double confidence)
{
DefaultBinaryConfusionMatrixConfidenceInterval.checkConfidence(confidence);
this.confidence = confidence;
}
/**
* Checks to make sure that confidence is between 0.0 and 1.0.
*
* @param confidence The confidence.
*/
protected static void checkConfidence(
final double confidence)
{
if ( confidence < 0.0 || confidence > 1.0 )
{
throw new IllegalArgumentException(
"confidence must be between 0.0 and 1.0");
}
}
@Override
public String toString()
{
return "True Negatives: " + this.getTrueNegativesRate() + "\n"
+ "False Positives: " + this.getFalsePositivesRate() + "\n"
+ "False Negatives: " + this.getFalseNegativesRate() + "\n"
+ "True Positives: " + this.getTruePositivesRate();
}
/**
* Computes the ConfidenceIntervals for the given Collection of
* ConfusionMatrices
* @param data
* Collection of ConfusionMatrices from which to compute the
* ConfidenceIntervals
* @param confidence
* Confidence that the statistic is within the bound, or 1-alpha, on the
* interval [0,1], where confidence=0 means definitely not within the bound
* and confidence=1 means definitely within the bound.
* @return
* ConfusionMatrixConfidenceInterval that captures the ConfidenceIntervals
* of the correct/incorrect classification rates
*/
static public DefaultBinaryConfusionMatrixConfidenceInterval compute(
Collection data,
double confidence )
{
ArrayList fpp = new ArrayList( data.size() );
ArrayList fnp = new ArrayList( data.size() );
ArrayList tpp = new ArrayList( data.size() );
ArrayList tnp = new ArrayList( data.size() );
for( DefaultBinaryConfusionMatrix cm : data )
{
double positives = cm.getTruePositivesCount() + cm.getFalseNegativesCount();
double negatives = cm.getTrueNegativesCount() + cm.getFalsePositivesCount();
// If there were no "positives" in the ConfusionMatrix, then
// we should not use the rates into the confidence intervals
if( positives != 0.0 )
{
tpp.add( cm.getTruePositivesRate() );
fnp.add( cm.getFalseNegativesRate() );
}
// If there were no "positives" in the ConfusionMatrix, then
// we should not use the rates into the confidence intervals
if( negatives != 0.0 )
{
tnp.add( cm.getTrueNegativesRate() );
fpp.add( cm.getFalsePositivesRate() );
}
}
StudentTConfidence ttest = new StudentTConfidence();
ConfidenceInterval fpci = ttest.computeConfidenceInterval( fpp, confidence );
ConfidenceInterval fnci = ttest.computeConfidenceInterval( fnp, confidence );
ConfidenceInterval tpci = ttest.computeConfidenceInterval( tpp, confidence );
ConfidenceInterval tnci = ttest.computeConfidenceInterval( tnp, confidence );
return new DefaultBinaryConfusionMatrixConfidenceInterval(
confidence, fpci, fnci, tpci, tnci );
}
/**
* An implementation of the {@code Summarizer} interface for creating a
* {@code ConfusionMatrixInterval}
*/
public static class Summary
extends AbstractCloneableSerializable
implements Summarizer
{
/** The confidence for the created interval. */
private double confidence;
/**
* Creates a new Summarizer.
*
* @param confidence The confidence for the interval.
*/
public Summary(
final double confidence)
{
super();
this.setConfidence(confidence);
}
public DefaultBinaryConfusionMatrixConfidenceInterval summarize(
final Collection data)
{
return DefaultBinaryConfusionMatrixConfidenceInterval.compute(data, confidence);
}
/**
* Gets the confidence for created the interval.
*
* @return The confidence for the created interval.
*/
public double getConfidence()
{
return this.confidence;
}
/**
* Sets the confidence for created the interval.
*
* @param confidence The confidence for the created interval.
*/
public void setConfidence(
final double confidence)
{
DefaultBinaryConfusionMatrixConfidenceInterval.checkConfidence(confidence);
this.confidence = confidence;
}
}
}