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Nous définissons le taux quadratique de concentration d'une mesure positive, ou taux quadratique de dispersion des valeurs de sa densité élémentaire. Appliqué aux valeurs propres d'un nuage de points dans un espace euclidien, ce taux s'interprète géométriquement comme un indice de non-sphéricité du nuage, rendant compte de sa capacité à être bien résumé par le(s) premier(s) axe(s). Nous donnons, en les commentant, les expressions de la variance corrigée et du taux de dispersion des valeurs propres...
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