Title: Statistical estimation of superhedging prices,
Abstract: We consider statistical estimation of superhedging prices using historical
stock returns in a frictionless market with d traded assets. We introduce a
simple plugin estimator based on empirical measures, show it is consistent but
lacks suitable robustness. This is addressed by our improved estimators which
use a larger set of martingale measures defined through a tradeoff between the
radius of Wasserstein balls around the empirical measure and the allowed norm
of martingale densities. We also study convergence rates, convergence of
superhedging strategies, and our study extends, in part, to the case of a
market with traded options and to a multiperiod setting.