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Equivalence of weak and strong modes of measures on topological vector spaces

8 August 2017
H. Lie
T. Sullivan
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Abstract

A strong mode of a probability measure on a normed space XXX can be defined as a point uuu such that the mass of the ball centred at uuu uniformly dominates the mass of all other balls in the small-radius limit. Helin and Burger weakened this definition by considering only pairwise comparisons with balls whose centres differ by vectors in a dense, proper linear subspace EEE of XXX, and posed the question of when these two types of modes coincide. We show that, in a more general setting of metrisable vector spaces equipped with non-atomic measures that are finite on bounded sets, the density of EEE and a uniformity condition suffice for the equivalence of these two types of modes. We accomplish this by introducing a new, intermediate type of mode. We also show that these modes can be inequivalent if the uniformity condition fails. Our results shed light on the relationships between among various notions of maximum a posteriori estimator in non-parametric Bayesian inference.

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