Package weka.experiment

Class Stats

java.lang.Object
weka.experiment.Stats
All Implemented Interfaces:
Serializable, RevisionHandler
public class Stats extends Object implements Serializable, RevisionHandler
A class to store simple statistics
Version:
$Revision: 1.12 $
Author:
Len Trigg (trigg@cs.waikato.ac.nz)
See Also:

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    double
    count
    The number of values seen
    double
    max
    The maximum value seen, or Double.NaN if no values seen
    double
    mean
    The mean of values at the last calculateDerived() call
    double
    min
    The minimum value seen, or Double.NaN if no values seen
    double
    stdDev
    The std deviation of values at the last calculateDerived() call
    double
    sum
    The sum of values seen
    double
    sumSq
    The sum of values squared seen

  • Constructor Summary

    Constructors
    Constructor
    Description
    Stats()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    void
    add(double value)
    Adds a value to the observed values
    void
    add(double value, double n)
    Adds a value that has been seen n times to the observed values
    void
    calculateDerived()
    Tells the object to calculate any statistics that don't have their values automatically updated during add.
    String
    getRevision()
    Returns the revision string.
    static void
    main(String[] args)
    Tests the paired stats object from the command line.
    void
    subtract(double value)
    Removes a value to the observed values (no checking is done that the value being removed was actually added).
    void
    subtract(double value, double n)
    Subtracts a value that has been seen n times from the observed values
    String
    toString()
    Returns a string summarising the stats so far.

    Methods inherited from class java.lang.Object

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

  • Field Details

    • count

      public double count
      The number of values seen

    • sum

      public double sum
      The sum of values seen

    • sumSq

      public double sumSq
      The sum of values squared seen

    • stdDev

      public double stdDev
      The std deviation of values at the last calculateDerived() call

    • mean

      public double mean
      The mean of values at the last calculateDerived() call

    • min

      public double min
      The minimum value seen, or Double.NaN if no values seen

    • max

      public double max
      The maximum value seen, or Double.NaN if no values seen

  • Constructor Details

    • Stats

      public Stats()

  • Method Details

    • add

      public void add(double value)
      Adds a value to the observed values
      Parameters:
      value - the observed value

    • add

      public void add(double value, double n)
      Adds a value that has been seen n times to the observed values
      Parameters:
      value - the observed value
      n - the number of times to add value

    • subtract

      public void subtract(double value)
      Removes a value to the observed values (no checking is done that the value being removed was actually added).
      Parameters:
      value - the observed value

    • subtract

      public void subtract(double value, double n)
      Subtracts a value that has been seen n times from the observed values
      Parameters:
      value - the observed value
      n - the number of times to subtract value

    • calculateDerived

      public void calculateDerived()
      Tells the object to calculate any statistics that don't have their values automatically updated during add. Currently updates the mean and standard deviation.

    • toString

      public String toString()
      Returns a string summarising the stats so far.
      Overrides:
      toString in class Object
      Returns:
      the summary string

    • getRevision

      public String getRevision()
      Returns the revision string.
      Specified by:
      getRevision in interface RevisionHandler
      Returns:
      the revision

    • main

      public static void main(String[] args)
      Tests the paired stats object from the command line. reads line from stdin, expecting two values per line.
      Parameters:
      args - ignored.