allows stopping the trial for efficacy if at least one target parameter reached efficacy at the look of interest.
eff.trial.any(eff.target)eff.trial.any returns a logical constant.
the 'BATSS' ingredient 'eff.target' corresponding to a logical vector of the same length as argument which (i.e., the number of target parameters) indicating if efficacy was reached for each target parameter at that stage or at a previous stage.