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arXiv 1605.00533math.STstat.MEstat.TH
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非线性分位数模型中的实时时变点检测

Real time change-point detection in a nonlinear quantile model

Gabriela Ciuperca

摘要:

实时时变点检测的研究大多集中在线性模型上,或者在经典的模型误差假设下使用了最大似然法。研究了非线性分位数模型中的序列变点检测问题。提出并研究了一种基于分位数过程次梯度和的检验统计量。在模型不变的原假设下,确定检验统计量的渐近分布。在备择假设下,在一些未知的观察有一个变化的模型,提出的检验统计量收敛于概率$\infty$。这些结果允许在开放端和封闭端程序上建立临界区域。模拟结果,使用Monte Carlo技术,调查的检验统计量的性能,特别是重尾误差分布。我们还将其与经典的CSCUM检验统计量进行了比较。

英文摘要:

Most studies in real time change-point detection either focus on the linear model or use the CUSUM method under classical assumptions on model errors. This paper considers the sequential change-point detection in a nonlinear quantile model. A test statistic based on the CUSUM of the quantile process subgradient is proposed and studied. Under null hypothesis that the model does not change, the asymptotic distribution of the test statistic is determined. Under alternative hypothesis that at some unknown observation there is a change in model, the proposed test statistic converges in probability to $\infty$. These results allow to build the critical regions on open-end and on closed-end procedures. Simulation results, using Monte Carlo technique, investigate the performance of the test statistic, specially for heavy-tailed error distributions. We also compare it with the classical CUSUM test statistic.

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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