weka.classifiers.trees.j48
Class Stats

java.lang.Object
  weka.classifiers.trees.j48.Stats

public class Stats

extends java.lang.Object

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

Version:

$Revision: 1.7 $

Author:

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

Constructor Summary

Stats()

Method Summary

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).

Methods inherited from class java.lang.Object

clone, equals, finalize, 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