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November 2017 Conditional convex orders and measurable martingale couplings
Lasse Leskelä, Matti Vihola
Bernoulli 23(4A): 2784-2807 (November 2017). DOI: 10.3150/16-BEJ827


Strassen’s classical martingale coupling theorem states that two random vectors are ordered in the convex (resp. increasing convex) stochastic order if and only if they admit a martingale (resp. submartingale) coupling. By analysing topological properties of spaces of probability measures equipped with a Wasserstein metric and applying a measurable selection theorem, we prove a conditional version of this result for random vectors conditioned on a random element taking values in a general measurable space. We provide an analogue of the conditional martingale coupling theorem in the language of probability kernels, and discuss how it can be applied in the analysis of pseudo-marginal Markov chain Monte Carlo algorithms. We also illustrate how our results imply the existence of a measurable minimiser in the context of martingale optimal transport.


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Lasse Leskelä. Matti Vihola. "Conditional convex orders and measurable martingale couplings." Bernoulli 23 (4A) 2784 - 2807, November 2017.


Received: 1 June 2014; Revised: 1 October 2015; Published: November 2017
First available in Project Euclid: 9 May 2017

zbMATH: 06778256
MathSciNet: MR3648045
Digital Object Identifier: 10.3150/16-BEJ827

Rights: Copyright © 2017 Bernoulli Society for Mathematical Statistics and Probability


Vol.23 • No. 4A • November 2017
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