Package weka.estimators

Class DDConditionalEstimator

java.lang.Object

weka.estimators.DDConditionalEstimator

All Implemented Interfaces:

RevisionHandler, ConditionalEstimator

public class DDConditionalEstimator
extends Object
implements ConditionalEstimator

Conditional probability estimator for a discrete domain conditional upon a discrete domain.

Version:

$Revision$

Author:

Len Trigg (trigg@cs.waikato.ac.nz)

Constructor Summary

Constructors

Constructor	Description
DDConditionalEstimator()	No-arg constructor needed to make WEKA's forName() work.
DDConditionalEstimator(int numSymbols, int numCondSymbols, boolean laplace)	Constructor

Method Summary

Modifier and Type	Method	Description
void	addValue(double data, double given, double weight)	Add a new data value to the current estimator.
Estimator	getEstimator(double given)	Get a probability estimator for a value
double	getProbability(double data, double given)	Get a probability estimate for a value
String	getRevision()	Returns the revision string.
static void	main(String[] argv)	Main method for testing this class.
String	toString()	Display a representation of this estimator

Methods inherited from class java.lang.Object

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

Constructor Detail

DDConditionalEstimator

public DDConditionalEstimator()

No-arg constructor needed to make WEKA's forName() work. Uses one symbol and Laplace.

DDConditionalEstimator

public DDConditionalEstimator(int numSymbols,
                              int numCondSymbols,
                              boolean laplace)

Constructor

Parameters:

numSymbols - the number of possible symbols (remember to include 0)

numCondSymbols - the number of conditioning symbols

laplace - if true, sub-estimators will use laplace

Method Detail

addValue

public void addValue(double data,
                     double given,
                     double weight)

Add a new data value to the current estimator.

Specified by:

addValue in interface ConditionalEstimator

Parameters:

data - the new data value

given - the new value that data is conditional upon

weight - the weight assigned to the data value

getEstimator

public Estimator getEstimator(double given)

Get a probability estimator for a value

Specified by:

getEstimator in interface ConditionalEstimator

Parameters:

given - the new value that data is conditional upon

Returns:

the estimator for the supplied value given the condition

getProbability

public double getProbability(double data,
                             double given)

Get a probability estimate for a value

Specified by:

getProbability in interface ConditionalEstimator

Parameters:

data - the value to estimate the probability of

given - the new value that data is conditional upon

Returns:

the estimated probability of the supplied value

toString

public String toString()

Display a representation of this estimator

Overrides:

toString in class Object

getRevision

public String getRevision()

Returns the revision string.

Specified by:

getRevision in interface RevisionHandler

Returns:

the revision

main

public static void main(String[] argv)

Main method for testing this class.

Parameters:

argv - should contain a sequence of pairs of integers which will be treated as symbolic.