weka.classifiers.trees.j48
Class Stats

java.lang.Object
  extended by weka.classifiers.trees.j48.Stats
All Implemented Interfaces:
RevisionHandler

public class Stats
extends java.lang.Object
implements RevisionHandler

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

Version:
$Revision: 1.9 $
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).
 java.lang.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 java.lang.String getRevision()
Returns the revision string.

Specified by:
getRevision in interface RevisionHandler
Returns:
the revision