Multivariate majorization of continuous statistical experiments

We derive sufficient and almost necessary conditions for large sample and catalytic majorization between finite statistical experiments over standard Borel sample spaces.

This work generalizes previous results, on one hand, in the bivariate case and, on the other hand, in the multivariate discrete (or, rather, finite) case, i.e., matrix majorization.

We derive multivariate generalizations of the bivariate Renyi relative entropies and show that inequalities involving these multivariate Renyi divergences characterize large-sample and catalytic majorization of finite statistical experiments.

As our methods are real-algebraic in nature, this work demonstrates that large deviation techniques are not the only option available to derive conditions for large sample majorization even in the case of more general sample spaces of the experiments.

We also show that all general multivariate divergences, i.e., multivariate extensive and monotone maps of finite statistical experiments, can be expressed through barycentres over the set of multivariate Renyi divergences.

We also show that we may characterize the optimal conversion rate of a statistical experiment into another using the multivariate Renyi divergences.