keel.Algorithms.Preprocess.Missing_Values.knnImpute

Class knnImpute

java.lang.Object

keel.Algorithms.Preprocess.Missing_Values.knnImpute.knnImpute

public class knnImpute
extends java.lang.Object

This class computes the mean (numerical) or mode (nominal) value of the attributes with missing values for the selected neighbours for a given instance with missing values

Constructor Summary

Constructors

Constructor and Description
knnImpute(java.lang.String fileParam) Creates a new instance of MostCommonValue

Method Summary

Modifier and Type	Method and Description
double	boundValueToAttributeLimits(double value, Attribute a) Takes a value and checks if it belongs to the attribute interval.
protected Instance	nearestValidNeighbor(Instance inst, int a) Finds the nearest neighbor with a valid value in the specified attribute
void	process() Process the training and test files provided in the parameters file to the constructor.
protected boolean	sameMissingInputAttributes(Instance inst1, Instance inst2) Checks if two instances present MVs for the same attributes

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

knnImpute

public knnImpute(java.lang.String fileParam)

Creates a new instance of MostCommonValue

Parameters:

fileParam - The path to the configuration file with all the parameters in KEEL format

Method Detail

sameMissingInputAttributes

protected boolean sameMissingInputAttributes(Instance inst1,
                                             Instance inst2)

Checks if two instances present MVs for the same attributes

Parameters:

inst1 - the first instance

inst2 - the second instance

Returns:

true if both instances have missing values for the same attributes, false otherwise

nearestValidNeighbor

protected Instance nearestValidNeighbor(Instance inst,
                                        int a)

Finds the nearest neighbor with a valid value in the specified attribute

Parameters:

inst - the instance to be taken as reference

a - the attribute which will be checked

Returns:

the nearest instance that has a valid value in the attribute 'a'

boundValueToAttributeLimits

public double boundValueToAttributeLimits(double value,
                                          Attribute a)

Takes a value and checks if it belongs to the attribute interval. If not, it returns the nearest limit. IT DOES NOT CHECK IF THE ATTRIBUTE IS NOT NOMINAL

Parameters:

value - the value to be checked

a - the attribute to which the value will be checked against

Returns:

the original value if it was in the interval limits of the attribute, or the nearest boundary limit otherwise.

process

public void process()

Process the training and test files provided in the parameters file to the constructor.