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- W1666335228 abstract "Confidence sets play a fundamental role in statistical inference. In this paper, we consider confidence intervals for high-dimensional linear regression with random design. We first establish the convergence rates of the minimax expected length for confidence intervals in the oracle setting where the sparsity parameter is given. The focus is then on the problem of adaptation to sparsity for the construction of confidence intervals. Ideally, an adaptive confidence interval should have its length automatically adjusted to the sparsity of the unknown regression vector, while maintaining a pre-specified coverage probability. It is shown that such a goal is in general not attainable, except when the sparsity parameter is restricted to a small region over which the confidence intervals have the optimal length of the usual parametric rate. It is further demonstrated that the lack of adaptivity is not due to the conservativeness of the minimax framework, but is fundamentally caused by the difficulty of learning the bias accurately." @default.
- W1666335228 created "2016-06-24" @default.
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- W1666335228 date "2017-04-01" @default.
- W1666335228 modified "2023-10-18" @default.
- W1666335228 title "Confidence intervals for high-dimensional linear regression: Minimax rates and adaptivity" @default.
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- W1666335228 doi "https://doi.org/10.1214/16-aos1461" @default.
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