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Joe Grengs, Policy & Planning for Social Equity in Transportation

Minimax expected measure confidence sets for restricted location parameters

Publication Abstract

Evans, S.E., Ben Hansen, and P.B. Stark. 2005. "Minimax expected measure confidence sets for restricted location parameters." Bernoulli, 11:571-590.

We study confidence sets for a parameter θ∈Θ that have minimax expected measure among random sets with at least 1-α coverage probability. We characterize the minimax sets using duality, which helps to find confidence sets with small expected measure and to bound improvements in expected measure compared with standard confidence sets. We construct explicit minimax expected length confidence sets for a variety of one-dimensional statistical models, including the bounded normal mean with known and with unknown variance. For the bounded normal mean with unit variance, the minimax expected measure 95% confidence interval has a simple form for Θ= [-τ, τ] with τ≤3.25. For Θ= [-3, 3], the maximum expected length of the minimax interval is about 14% less than that of the minimax fixed-length affine confidence interval and about 16% less than that of the truncated conventional interval [X -1.96, X + 1.96] ∩[-3,3].

DOI:10.3150/bj/1126126761 (Full Text)

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