In classical (frequentist)<unk>  theory, an<unk>  is a<unk>  for making a<unk>  that is "better" than any other<unk>  that may compete with it, in a specific sense defined below. Generally speaking, in most<unk>  problems the set of<unk> <unk> s is large, even infinite, but as will be seen there are good reasons to favor<unk> <unk> s.
Admissible decision rule
Scientific consensus
Causality
Design of experiments
Block design
Unblinding
User contributions
Evidence based practice