org.dkpro.statistics.agreement.distance

Class RatioDistanceFunction

java.lang.Object

org.dkpro.statistics.agreement.distance.RatioDistanceFunction

All Implemented Interfaces:

IDistanceFunction

public class RatioDistanceFunction
extends Object
implements IDistanceFunction

Implementation of the IDistanceFunction interface for scoring the distance between ratio-scaled categories. That is to say, categories represent a numerical value whose difference and distance to a zero element can be measured. A typical example is measuring the time needed for a certain task: it makes a large difference if one accomplishes the task in 1 minute or in 5 minutes, but there is not much difference between requiring 3 full hours and 3 hours plus 5 minutes. Mathematically, the ratio scale allows for the equality, comparison, addition, and multiplication operations, which is why probabilities and measuring entropy is an often-used example for ratio scaled values (cf. Resnik & Lin, 2010). The distance function assumes the categories to be integers or doubles and falls back to a NominalDistanceFunction for other data types.

References:

• Krippendorff, K.: Content Analysis: An Introduction to Its Methodology. Beverly Hills, CA: Sage Publications, 1980.
• Resnik, P. & Lin, J.: Evaluation of NLP Systems. In: The Handbook of Computational Licensesnguistics and Natural Language Processing, p. 271–295, Chichester/Malden: Wiley-Blackwell, 2010.

Author:

Christian M. Meyer

See Also:

IDistanceFunction

Constructor Summary

Constructors

Constructor and Description
RatioDistanceFunction()

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

RatioDistanceFunction

public RatioDistanceFunction()

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