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arXiv 2102.07967math.STstat.MEstat.TH
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无分布的条件中位数推断

Distribution-Free Conditional Median Inference

Dhruv Medarametla, Emmanuel J. Candès

摘要:

我们认为,在我们不愿意对数据$(X,Y)$的基本分布做任何假设的情况下,构造响应$Y \in \mathbb{R}$的中位数的置信区间的问题。我们提出了一种方法的基础上,从共形预测的想法,并建立一个理论保证的覆盖范围,同时也去了特定的分布,其性能是尖锐的。此外,我们证明了条件中位数的置信区间和响应变量的置信区间之间的等价性,从而导致任何可能的条件中位数置信区间的长度的下界。该下界与样本量无关,适用于所有无点质量的分布。

英文摘要:

We consider the problem of constructing confidence intervals for the median of a response $Y \in \mathbb{R}$ conditional on features $X \in \mathbb{R}^d$ in a situation where we are not willing to make any assumption whatsoever on the underlying distribution of the data $(X,Y)$. We propose a method based upon ideas from conformal prediction and establish a theoretical guarantee of coverage while also going over particular distributions where its performance is sharp. Additionally, we prove an equivalence between confidence intervals for the conditional median and confidence intervals for the response variable, resulting in a lower bound on the length of any possible conditional median confidence interval. This lower bound is independent of sample size and holds for all distributions with no point masses.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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