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Class weka.experiment.Stats 

java.lang.Object
   |
   +----weka.experiment.Stats
public class Stats
extends Object
A class to store simple statistics

Version:
$Revision: 1.3 $
Author:
Len Trigg (trigg@cs.waikato.ac.nz)

Variable Index

o count
The number of values seen
o max
The maximum value seen
o mean
The mean of values at the last calculateDerived() call
o min
The minimum value seen
o stdDev
The std deviation of values at the last calculateDerived() call
o sum
The sum of values seen
o sumSq
The sum of values squared seen

Constructor Index

o Stats()

Method Index

o add(double)
Adds a value to the observed values
o add(double, double)
Adds a value that has been seen n times to the observed values
o calculateDerived()
Tells the object to calculate any statistics that don't have their values automatically updated during add.
o subtract(double)
Removes a value to the observed values (no checking is done that the value being removed was actually added).
o toString()
Returns a string summarising the stats so far.

Variables

o count 
 public double count
The number of values seen

o sum 
 public double sum
The sum of values seen

o sumSq 
 public double sumSq
The sum of values squared seen

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

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

o min 
 public double min
The minimum value seen

o max 
 public double max
The maximum value seen

Constructors

o Stats 
 public Stats()

Methods

o add 
 public void add(double value)
Adds a value to the observed values

Parameters:
value - the observed value
o 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
o 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
o 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.

o toString 
 public String toString()
Returns a string summarising the stats so far.

Returns:
the summary string
Overrides:
toString in class Object 
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