Package weka.experiment
Class PairedStats
- java.lang.Object
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- weka.experiment.PairedStats
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- All Implemented Interfaces:
RevisionHandler
- Direct Known Subclasses:
PairedStatsCorrected
public class PairedStats extends java.lang.Object implements RevisionHandler
A class for storing stats on a paired comparison (t-test and correlation)- Version:
- $Revision: 1.10 $
- Author:
- Len Trigg (trigg@cs.waikato.ac.nz)
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Field Summary
Fields Modifier and Type Field Description double
correlation
The correlation coefficientdouble
count
The number of data points seendouble
differencesProbability
The probability of obtaining the observed differencesint
differencesSignificance
A significance indicator: 0 if the differences are not significant > 0 if x significantly greater than y < 0 if x significantly less than yStats
differencesStats
The stats associated with the paired differencesdouble
sigLevel
The significance level for comparisonsStats
xStats
The stats associated with the data in column 1double
xySum
The sum of the productsStats
yStats
The stats associated with the data in column 2
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Constructor Summary
Constructors Constructor Description PairedStats(double sig)
Creates a new PairedStats object with the supplied significance level.
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description void
add(double[] value1, double[] value2)
Adds an array of observed pair of values.void
add(double value1, double value2)
Add an observed pair of values.void
calculateDerived()
Calculates the derived statistics (significance etc).int
getDegreesOfFreedom()
Gets the degrees of freedom.java.lang.String
getRevision()
Returns the revision string.static void
main(java.lang.String[] args)
Tests the paired stats object from the command line.void
setDegreesOfFreedom(int d)
Sets the degrees of freedom (if calibration is required).void
subtract(double[] value1, double[] value2)
Removes an array of observed pair of values.void
subtract(double value1, double value2)
Removes an observed pair of values.java.lang.String
toString()
Returns statistics on the paired comparison.
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Field Detail
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xStats
public Stats xStats
The stats associated with the data in column 1
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yStats
public Stats yStats
The stats associated with the data in column 2
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differencesStats
public Stats differencesStats
The stats associated with the paired differences
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differencesProbability
public double differencesProbability
The probability of obtaining the observed differences
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correlation
public double correlation
The correlation coefficient
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xySum
public double xySum
The sum of the products
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count
public double count
The number of data points seen
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differencesSignificance
public int differencesSignificance
A significance indicator: 0 if the differences are not significant > 0 if x significantly greater than y < 0 if x significantly less than y
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sigLevel
public double sigLevel
The significance level for comparisons
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Method Detail
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setDegreesOfFreedom
public void setDegreesOfFreedom(int d)
Sets the degrees of freedom (if calibration is required).
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getDegreesOfFreedom
public int getDegreesOfFreedom()
Gets the degrees of freedom.
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add
public void add(double value1, double value2)
Add an observed pair of values.- Parameters:
value1
- the value from column 1value2
- the value from column 2
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subtract
public void subtract(double value1, double value2)
Removes an observed pair of values.- Parameters:
value1
- the value from column 1value2
- the value from column 2
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add
public void add(double[] value1, double[] value2)
Adds an array of observed pair of values.- Parameters:
value1
- the array containing values from column 1value2
- the array containing values from column 2
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subtract
public void subtract(double[] value1, double[] value2)
Removes an array of observed pair of values.- Parameters:
value1
- the array containing values from column 1value2
- the array containing values from column 2
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calculateDerived
public void calculateDerived()
Calculates the derived statistics (significance etc).
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toString
public java.lang.String toString()
Returns statistics on the paired comparison.- Overrides:
toString
in classjava.lang.Object
- Returns:
- the t-test statistics as a string
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getRevision
public java.lang.String getRevision()
Returns the revision string.- Specified by:
getRevision
in interfaceRevisionHandler
- Returns:
- the revision
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main
public static void main(java.lang.String[] args)
Tests the paired stats object from the command line. reads line from stdin, expecting two values per line.- Parameters:
args
- ignored.
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