Tandem-width sequential confidence intervals for a Bernoulli proportion
Tandem-width sequential confidence intervals for a Bernoulli proportion
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伯努利比例的串联宽度连续置信区间
DOI:
10.1080/07474946.2019.1611315
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发表时间:
2019
期刊:
影响因子:
--
通讯作者:
Moustakides, George V.
中科院分区:
文献类型:
--
作者:
Yaacoub, Tony;Goldsman, David;Mei, Yajun;Moustakides, George V.
We propose a two-stage sequential method for obtaining tandem-width confidence intervals for a Bernoulli proportionp. The term “tandem-width” refers to the fact that the half-width of theconfidence interval is not fixed beforehand; it is instead required to satisfy two different half-width upper bounds,h0andh1, depending on the (unknown) values ofp. To tackle this problem, we first propose a simple but useful sequential method for obtaining fixed-width confidence intervals forp, whose stopping rule is based on the minimax estimator ofp. We observe Bernoulli(p) trials sequentially, and for some fixed half-widthh=h0orh1, we develop a stopping timeTsuch that the resulting confidence interval forp, [], covers the parameter with confidence at leastwhereis the maximum likelihood estimator ofpat timeT. Furthermore, we derive theoretical properties of our proposed fixed-width and tandem-width methods and compare their performances with existing alternative sequential schemes. The proposed minimax-based fixed-width method performs similarly to alternative fixed-width methods, while being easier to implement in practice. In addition, the proposed tandem-width method produces effective savings in sample size compared to the fixed-width counterpart and provides excellent results for scientists to use when no prior knowledge ofpis available.
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