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Nonexistence of a universally optimal plan and A-optimality of ${\cal P}_2$
Nonexistence and A-optimality conjecture. The hypothetical plan ${\cal P}^*$ does not exist, and ${\cal P}_2$ is A-optimal.
Conjectureopenoptimal-design orthogonal-plansarXiv posted 3 days ago

Nonexistence of a universally optimal plan and A-optimality of P2{\cal P}_2P2​