Estimating location parameters in sample-heterogeneous distributions
Estimating location parameters in sample-heterogeneous distributions
复制标题
估计样本异质分布中的位置参数
DOI:
10.1093/imaiai/iaab013
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发表时间:
2021
期刊:
影响因子:
--
通讯作者:
Loh, Po-Ling
中科院分区:
文献类型:
--
作者:
Pensia, Ankit;Jog, Varun;Loh, Po-Ling
Estimating the mean of a probability distribution using i.i.d. samples is a classical problem in statistics, wherein finite-sample optimal estimators are sought under various distributional assumptions. In this paper, we consider the problem of mean estimation when independent samples are drawn from-dimensional non-identical distributions possessing a common mean. When the distributions are radially symmetric and unimodal, we propose a novel estimator, which is a hybrid of the modal interval, shorth and median estimators and whose performance adapts to the level of heterogeneity in the data. We show that our estimator is near optimal when data are i.i.d. and when the fraction of ‘low-noise’ distributions is as small as, whereis the number of samples. We also derive minimax lower bounds on the expected error of any estimator that is agnostic to the scales of individual data points. Finally, we extend our theory to linear regression. In both the mean estimation and regression settings, we present computationally feasible versions of our estimators that run in time polynomial in the number of data points.
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影响因子:
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作者:
P. Sen
通讯作者:
P. Sen
影响因子:
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作者:
Jiange Li;Arnaud Marsiglietti;J. Melbourne
通讯作者:
J. Melbourne
DOI:
--
发表时间:
2020
期刊:
Proceedings of Machine Learning Research
影响因子:
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作者:
Liang, Y;Yuan, H
通讯作者:
Yuan, H
DOI:
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发表时间:
1998
期刊:
影响因子:
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作者:
I. Mizera;J. Wellner
通讯作者:
J. Wellner
DOI:
10.1214/09-imscoll508
发表时间:
2009-01-01
期刊:
Institute of Mathematical Statistics collections
影响因子:
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作者:
van der Vaart A;Wellner JA
通讯作者:
Wellner JA