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Fréchet mean and variance provide a way of obtaining a mean and variance for metric space-valued random variables, and can be used for statistical analysis of data objects that lie in abstract spaces ...
Alan D. Hutson, Michael D. Ernst, The Exact Bootstrap Mean and Variance of an L-Estimator, Journal of the Royal Statistical Society. Series B (Statistical Methodology), Vol. 62, No. 1 (2000), pp.