com.compomics.util.math.roc

Class DistributionRoc

java.lang.Object

com.compomics.util.math.roc.DistributionRoc

All Implemented Interfaces:

ROC

public class DistributionRoc
extends Object
implements ROC

This class can be used to draw roc curves from experimental data.

Author:

Marc Vaudel

Constructor Summary

Constructors

Constructor and Description
DistributionRoc(Distribution distributionControl, Distribution distributionPatient) Constructor.

Method Summary

Modifier and Type	Method and Description
double	getAuc() Returns an estimation of the area under the curve.
double	getSpecificityAt(double sensitivity) Returns the 1-specificity at a given sensitivity.
double	getValueAt(double specificity) Returns the sensitivity at a given 1-specificity, i.e., 1-type 2 error, the number of true healthy for a given type 1 error, the number of false healthy.
double[][]	getxYValues() Returns xy values to draw the curve.

Methods inherited from class java.lang.Object

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

Constructor Detail

DistributionRoc

public DistributionRoc(Distribution distributionControl,
                       Distribution distributionPatient)

Constructor. The patient distribution should be higher (to the right) than the control distribution.

Parameters:

distributionControl - the control distribution

distributionPatient - the patient distribution

Method Detail

getValueAt

public double getValueAt(double specificity)
                  throws org.apache.commons.math.MathException

Description copied from interface: ROC

Returns the sensitivity at a given 1-specificity, i.e., 1-type 2 error, the number of true healthy for a given type 1 error, the number of false healthy.

Specified by:

getValueAt in interface ROC

Parameters:

specificity - the specificity (0.1 is 10%)

Returns:

the sensitivity at the given specificity (0.1 is 10%)

Throws:

org.apache.commons.math.MathException - if a MathException occurs

getSpecificityAt

public double getSpecificityAt(double sensitivity)
                        throws org.apache.commons.math.MathException

Description copied from interface: ROC

Returns the 1-specificity at a given sensitivity.

Specified by:

getSpecificityAt in interface ROC

Parameters:

sensitivity - the sensitivity (0.1 is 10%)

Returns:

the corresponding 1-specificity (0.1 is 10%)

Throws:

org.apache.commons.math.MathException - if a MathException occurs

getxYValues

public double[][] getxYValues()
                       throws org.apache.commons.math.MathException

Description copied from interface: ROC

Returns xy values to draw the curve.

Specified by:

getxYValues in interface ROC

Returns:

xy values to draw the curve

Throws:

org.apache.commons.math.MathException - if a MathException occurs

getAuc

public double getAuc()
              throws org.apache.commons.math.MathException

Description copied from interface: ROC

Returns an estimation of the area under the curve.

Specified by:

getAuc in interface ROC

Returns:

an estimation of the area under the curve

Throws:

org.apache.commons.math.MathException - if a MathException occurs