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	Silhouette Score	Indice di Rand Aggiustato
Campo	Valutazione dei modelli	Valutazione dei modelli
Famiglia	MCDM	MCDM
Anno di origine	1987	1985
Ideatore	Peter Rousseeuw	Lawrence Hubert, Phipps Arabie
Tipo	Cluster quality metric	External similarity metric
Fonte seminale	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.	Hubert, L., & Arabie, P. (1985). Comparing partitions. Journal of Classification, 2(1), 193-218.
Alias	silhouette coefficient, silhouette index	ARI, adjusted Rand coefficient
Correlati	5	5
Sintesi	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.	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.