org.dkpro.statistics.agreement.distance

Class NominalDistanceFunction

java.lang.Object

org.dkpro.statistics.agreement.distance.NominalDistanceFunction

All Implemented Interfaces:

IDistanceFunction

public class NominalDistanceFunction
extends Object
implements IDistanceFunction

Implementation of the IDistanceFunction interface for scoring the distance between nominal-scaled categories. That is to say, categories are either equal (distance 0) or unequal (distance 1). A typical example for nominal-scaled categories are the part of speech tags NOUN, VERB, and ADJECTIVE. Mathematically, the nominal scale only allows for the equality operation, but prohibits comparison, addition, and multiplication. The distance function makes no assumption regarding the data type and thus allows for strings, enums, integers, etc.

References:

• Krippendorff, K.: Content Analysis: An Introduction to Its Methodology. Beverly Hills, CA: Sage Publications, 1980.

Author:

Kostadin Cholakov, Christian M. Meyer

See Also:

IDistanceFunction

Constructor Summary

Constructors

Constructor and Description
NominalDistanceFunction()

Method Summary

Modifier and Type	Method and Description
double	measureDistance(IAnnotationStudy study, Object category1, Object category2) Returns a distance value for the given pair of categories used within the given annotation study.

Methods inherited from class java.lang.Object

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

Constructor Detail

NominalDistanceFunction

public NominalDistanceFunction()

Method Detail

measureDistance

public double measureDistance(IAnnotationStudy study,
                              Object category1,
                              Object category2)

Description copied from interface: IDistanceFunction

Returns a distance value for the given pair of categories used within the given annotation study. Normally, the measure should return a distance of 0 if, and only if, the two categories are equal and a positive number otherwise.

Specified by:

measureDistance in interface IDistanceFunction