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arXiv 1906.09712math.STmath.PRstat.MEstat.MLstat.TH
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分位数的序贯估计及其在A/B检验和最佳臂识别中的应用

Sequential estimation of quantiles with applications to A/B-testing and best-arm identification

Steven R. Howard, Aaditya Ramdas

摘要:

我们提出了置信序列-序列的置信区间,这是有效的,随着时间的推移均匀-任何分布的分位数在一个完整的,全序集,基于流的独立同分布。意见。我们给出了跟踪固定分位数和同时跟踪所有分位数的方法。具体来说,我们提供了明确的表达式与小常数的间隔,其宽度以最快的可能的$\sqrt{t^{-1} \log\log t}$率收缩,随着时间的推移,以相同的速率均匀地举行的经验分布函数的非渐近浓度不等式。后者加强了Smirnov的经验过程律的重对数和扩展的Dvoretzky-Kiefer-Wolfowitz不等式保持一致的时间。我们给出了一个新的算法和样本的复杂性界选择一个近似最好的分位数在多臂强盗框架的手臂。在模拟中,我们的方法需要的样本比现有方法少五到五十倍。

英文摘要:

We propose confidence sequences -- sequences of confidence intervals which are valid uniformly over time -- for quantiles of any distribution over a complete, fully-ordered set, based on a stream of i.i.d. observations. We give methods both for tracking a fixed quantile and for tracking all quantiles simultaneously. Specifically, we provide explicit expressions with small constants for intervals whose widths shrink at the fastest possible $\sqrt{t^{-1} \log\log t}$ rate, along with a non-asymptotic concentration inequality for the empirical distribution function which holds uniformly over time with the same rate. The latter strengthens Smirnov's empirical process law of the iterated logarithm and extends the Dvoretzky-Kiefer-Wolfowitz inequality to hold uniformly over time. We give a new algorithm and sample complexity bound for selecting an arm with an approximately best quantile in a multi-armed bandit framework. In simulations, our method requires fewer samples than existing methods by a factor of five to fifty.

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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