Package ubic.basecode.math

Class ROC

java.lang.Object

ubic.basecode.math.ROC

public class ROC
extends Object

Functions for calculating Receiver operator characteristics.

Author:

Paul Pavlidis

Constructor Summary

Constructors

Constructor	Description
ROC()

Method Summary

Modifier and Type	Method	Description
static double	aroc(int totalSize, List<Double> ranks)	Calculate area under ROC, up to a given number of False positives.
static double	rocpval(int totalSize, List<Double> ranks)	For an AROC value, calculates a p value.

Methods inherited from class java.lang.Object

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

Constructor Detail

ROC

public ROC()

Method Detail

aroc

public static double aroc(int totalSize,
                          List<Double> ranks)

Calculate area under ROC, up to a given number of False positives. The input is the total number of items in the data, and the ranks of the positives in the current ranking. LOW ranks are considered better. (e.g., rank 1 is the 'best')

Parameters:

totalSize -

ranks - LOW ranks are considered better. (e.g., rank 1 is the 'best')

Returns:

AROC

rocpval

public static double rocpval(int totalSize,
                             List<Double> ranks)

For an AROC value, calculates a p value. Uses fact that ROC is equivalent to the Wilcoxon rank sum test.

Parameters:

numpos - How many positives are in the data.

Ranks - of objects in the class, where low ranks are considered better. (one-based)

Returns:

The p value.