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m →Distance covariance: Removed a hanging "in" from the end of a sentence by repeating the cited authors' names. |
m Disambiguating links to Mean difference (link changed to Mean absolute difference) using DisamAssist. |
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\operatorname{dVar}^2_n(X) := \operatorname{dCov}^2_n(X,X) = \tfrac{1}{n^2}\sum_{k,\ell}A_{k,\ell}^2,
</math>
which is a relative of [[Corrado Gini]]’s [[Mean absolute difference|mean difference]] introduced in 1912 (but Gini did not work with centered distances).
===Distance standard deviation===
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