Package weka.classifiers.trees.j48

Class Stats

java.lang.Object

weka.classifiers.trees.j48.Stats

All Implemented Interfaces:

RevisionHandler

public class Stats
extends Object
implements RevisionHandler

Class implementing a statistical routine needed by J48 to compute its error estimate.

Version:

$Revision$

Author:

Eibe Frank (eibe@cs.waikato.ac.nz)

Constructor Summary

Constructors

Constructor	Description
Stats()

Method Summary

Modifier and Type	Method	Description
static double	addErrs(double N, double e, float CF)	Computes estimated extra error for given total number of instances and error using normal approximation to binomial distribution (and continuity correction).
String	getRevision()	Returns the revision string.

Methods inherited from class java.lang.Object

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

Constructor Detail

Stats

public Stats()

Method Detail

addErrs

public static double addErrs(double N,
                             double e,
                             float CF)

Computes estimated extra error for given total number of instances and error using normal approximation to binomial distribution (and continuity correction).

Parameters:

N - number of instances

e - observed error

CF - confidence value

getRevision

public String getRevision()

Returns the revision string.

Specified by:

getRevision in interface RevisionHandler

Returns:

the revision