McMorris, F.R.; Mulder, H.M.; Powers, R.C. - Erasmus University Rotterdam, Econometric Institute - 2005
A median of a sequence ï° = x1, x2, … , xk of elements of a finite metric space (X, d ) is an element x for which  1 ≤ I ≤ k d(x, xi) is minimum. The function M with domain the set of all finite sequences on X and defined by M(ï°) = {x: x is a median of ï°} is...