手法を比較

	シルエット係数	調整ランド指数（ARI）
分野	モデル評価	モデル評価
系統	MCDM	MCDM
提唱年	1987	1985
提唱者	Peter Rousseeuw	Lawrence Hubert, Phipps Arabie
種類	Cluster quality metric	External similarity metric
原典	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.
別名	silhouette coefficient, silhouette index	ARI, adjusted Rand coefficient
関連	5	5
概要	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.