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WithinBetweenRatio<TInstance> 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
ClusteringResult<TInstance> provides the optimal partition, i.e., the optimal
ClusterSet<TInstance>.
Inheritance HierarchyNamespace: Aglomera.Evaluation.Internal
Assembly: Aglomera (in Aglomera.dll) Version: 1.1.0
SyntaxC#
public class WithinBetweenRatio<TInstance> : IInternalEvaluationCriterion<TInstance> where TInstance : Object, IComparable<TInstance>
Type Parameters
- TInstance
- The type of instance considered.
The WithinBetweenRatio<TInstance> type exposes the following members.
Constructors| Name | Description | |
|---|---|---|
 | WithinBetweenRatio<TInstance> |
Creates a new WithinBetweenRatio<TInstance> with given dissimilarity metric.
|
Properties| Name | Description | |
|---|---|---|
 | DissimilarityMetric |
Gets the metric used by this criterion to measure the dissimilarity / distance between cluster elements.
|
Methods| Name | Description | |
|---|---|---|
| Equals | (Inherited from Object.) |
| Evaluate |
Evaluates the given ClusterSet<TInstance> partition according to this evaluation criterion.
|
 | Finalize | (Inherited from Object.) |
| GetHashCode | (Inherited from Object.) |
| GetType | (Inherited from Object.) |
| MemberwiseClone | (Inherited from Object.) |
| ToString | (Inherited from Object.) |
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