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	Indice di Rand Aggiustato	Silhouette Score
Campo	Valutazione dei modelli	Valutazione dei modelli
Famiglia	MCDM	MCDM
Anno di origine	1985	1987
Ideatore	Lawrence Hubert, Phipps Arabie	Peter Rousseeuw
Tipo	External similarity metric	Cluster quality metric
Fonte seminale	Hubert, L., & Arabie, P. (1985). Comparing partitions. Journal of Classification, 2(1), 193-218.	Rousseeuw, P. J. (1987). Silhouettes: a graphical aid to the interpretation and validation of cluster analysis. Journal of Computational and Applied Mathematics, 20, 53-65.
Alias	ARI, adjusted Rand coefficient	silhouette coefficient, silhouette index
Correlati	5	5
Sintesi	The Adjusted Rand Index (ARI), developed by Hubert and Arabie in 1985, is an external clustering evaluation metric that measures the agreement between a predicted clustering and a ground truth labeling. It ranges from -1 to 1, where 1 indicates perfect agreement, 0 indicates random clustering, and negative values indicate performance worse than random chance.	The Silhouette Coefficient, introduced by Peter Rousseeuw in 1987, is a metric that measures how similar an object is to its own cluster compared to other clusters. It ranges from -1 to 1, where values close to 1 indicate well-separated and cohesive clusters, values near 0 suggest overlapping clusters, and negative values indicate misclustered points.