David D. L. Minh and John D. Chodera Existing optimal estimators of nonequilibrium path-ensemble averages are shown to fall within the framework of extended bridge sampling. Using this framework, we derive a general minimal-variance estimator that can combine nonequilibrium trajectory data sampled from multiple path-ensembles to estima ... [J. Chem. Phys. 131, 134110 (2009)] published Tue Oct 6, 2009.