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WithinBetweenRatioTInstance Class

Implements the within-between ratio (WB) internal evaluation method in [1] measuring the ratio of the sum-of-squares within cluster (SSW) and sum-of-squares between clusters(SSB). The result is multiplied by the negative of the number of clusters so that maximizing the ratio in some ClusteringResultTInstance provides the optimal partition, i.e., the optimal ClusterSetTInstance.
Inheritance Hierarchy
SystemObject
  Aglomera.Evaluation.InternalWithinBetweenRatioTInstance

Namespace:  Aglomera.Evaluation.Internal
Assembly:  Aglomera (in Aglomera.dll) Version: 1.1.0
Syntax
C#
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public class WithinBetweenRatio<TInstance> : IInternalEvaluationCriterion<TInstance>
where TInstance : Object, IComparable<TInstance>
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Type Parameters

TInstance
The type of instance considered.

The WithinBetweenRatioTInstance type exposes the following members.

Constructors
  NameDescription
Public methodWithinBetweenRatioTInstance
Creates a new WithinBetweenRatioTInstance with given dissimilarity metric.
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Properties
  NameDescription
Public propertyDissimilarityMetric
Gets the metric used by this criterion to measure the dissimilarity / distance between cluster elements.
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Methods
  NameDescription
Public methodEquals (Inherited from Object.)
Public methodEvaluate
Evaluates the given ClusterSetTInstance partition according to this evaluation criterion.
Protected methodFinalize (Inherited from Object.)
Public methodGetHashCode (Inherited from Object.)
Public methodGetType (Inherited from Object.)
Protected methodMemberwiseClone (Inherited from Object.)
Public methodToString (Inherited from Object.)
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Remarks
Notes: - In the original formulation in [1] the value was minimized, hence this implementation returns the negative WB ratio. References: [1] - Zhao, Q., Xu, M., & Fränti, P. (2009, April). Sum-of-Squares Based Cluster Validity Index and Significance Analysis. In ICANNGA (Vol. 5495, pp. 313-322).
See Also