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	Distanza di Hellinger	Divergenza di Kullback-Leibler
Campo	Processo decisionale	Processo decisionale
Famiglia	MCDM	MCDM
Anno di origine	1909	1951
Ideatore	Ernst Hellinger	Solomon Kullback and Richard Leibler
Tipo	Symmetric metric for probability distributions	Asymmetric probability distribution dissimilarity
Fonte seminale	Hellinger, E. (1909). Neue Begründung der Theorie quadratischer Formen von unendlichvielen Veränderlichen. Journal für die Reine und Angewandte Mathematik, 136, 210-271.	Kullback, S., & Leibler, R. A. (1951). On information and sufficiency. Annals of Mathematical Statistics, 22(1), 79-86.
Alias	Bhattacharyya distance, Hellinger metric	KL divergence, relative entropy, information divergence
Correlati	2	2
Sintesi	Hellinger distance is a symmetric, bounded metric that measures the difference between two probability distributions. Rooted in the work of Ernst Hellinger (1909) and later formalized in statistical divergence by Anil Bhattacharyya (1946), this distance ranges from 0 (identical distributions) to 1. It is a true metric satisfying all mathematical distance properties and is particularly well-suited for comparing probability distributions in a symmetric, numerically stable manner.	Kullback-Leibler divergence, also called relative entropy or information divergence, measures the asymmetric difference between two probability distributions. Introduced by Solomon Kullback and Richard Leibler in 1951, this information-theoretic measure quantifies how one probability distribution diverges from a reference distribution, ranging from 0 (identical distributions) to infinity. It is foundational in information theory, machine learning, and decision-making with probabilistic frameworks.