it.uniroma2.sag.kelp.data.manipulator

Class StandardizationManipulator

java.lang.Object

it.uniroma2.sag.kelp.data.manipulator.StandardizationManipulator

All Implemented Interfaces:

Manipulator

public class StandardizationManipulator
extends Object
implements Manipulator

It standardizes the feature values of a vectorial representation. Let \(x_i\) be the value of the i-th feature whose mean and standard deviation are \(\mu_i\) and \(\sigma_i\) respectively. Then the standardized value is \(\hat{x_i} = (x_i-\mu_i)/\sigma_i\)

Author:

Simone Filice

Constructor Summary

Constructors

Constructor and Description
StandardizationManipulator(String representation, List<Example> examples) Constructor

Method Summary

Methods

Modifier and Type	Method and Description
void	manipulate(Example example)
void	standardize(Vector vector) It standardizes the feature values of vector.

Methods inherited from class java.lang.Object

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

Constructor Detail

StandardizationManipulator

public StandardizationManipulator(String representation,
                          List<Example> examples)

Constructor

Parameters:

representation - the vectorial representation to be standardized

examples - the examples on which computing the feature means and standard deviations to be applied during the standardization process

Method Detail

standardize

public void standardize(Vector vector)

It standardizes the feature values of vector. Let \(x_i\) be the value of the i-th feature whose mean and standard deviation are \(\mu_i\) and \(\sigma_i\) respectively. Then the standardized value is \(\hat{x_i} = (x_i-\mu_i)/\sigma_i\)

Parameters:

vector - the vector to be standardized

manipulate

public void manipulate(Example example)

Specified by:

manipulate in interface Manipulator