weka.estimators

Interface ConditionalEstimator

All Superinterfaces:

RevisionHandler

All Known Implementing Classes:

DDConditionalEstimator, DKConditionalEstimator, DNConditionalEstimator, KDConditionalEstimator, KKConditionalEstimator, NDConditionalEstimator, NNConditionalEstimator

public interface ConditionalEstimator
extends RevisionHandler

Interface for conditional probability estimators. Example code:

   NNConditionalEstimator newEst = new NNConditionalEstimator();

   // Create 50 random points and add them
   Random r = new Random(seed);
   for(int i = 0; i < 50; i++) {
     int x = Math.abs(r.nextInt() % 100);
     int y = Math.abs(r.nextInt() % 100);
     System.out.println("# " + x + "  " + y);
     newEst.addValue(x, y, 1);
   }

   // Pick a random conditional value
   int cond = Math.abs(r.nextInt() % 100);
   System.out.println("## Conditional = " + cond);

   // Print the probabilities conditional on that value
   Estimator result = newEst.getEstimator(cond);
   for(int i = 0; i <= 100; i+= 5) {
     System.out.println(" " + i + "  " + result.getProbability(i));
   }
 

Version:

$Revision: 1.7 $

Author:

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

Method Summary

Modifier and Type	Method and 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 for a value conditional on another value

Methods inherited from interface weka.core.RevisionHandler

getRevision

Method Detail

addValue

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

Add a new data value to the current estimator.

Parameters:

data - the new data value

given - the new value that data is conditional upon

weight - the weight assigned to the data value

getEstimator

Estimator getEstimator(double given)

Get a probability estimator for a value

Parameters:

given - the new value that data is conditional upon

Returns:

the estimator for the supplied value given the condition

getProbability

double getProbability(double data,
                      double given)

Get a probability for a value conditional on another value

Parameters:

data - the value to estimate the probability of

given - the new value that data is conditional upon

Returns:

the estimator for the supplied value given the condition