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arXiv 2107.09150stat.MEmath.STstat.MLstat.TH
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高维均值漂移模型中变点的推断

Inference for Change Points in High Dimensional Mean Shift Models

Abhishek Kaul, George Michailidis

摘要:

研究了高维均值漂移模型中变点位置的置信区间构造问题。为此,我们开发了一个本地改装最小二乘估计,并获得组件明智的和同时估计率的基础变化点。同时速率是文献中最快的,至少是$\log p,$的一个因子,而分量式速率是最佳的。这些结果使极限分布的存在。两个消失和非零跳跃大小制度下的特征,而联合分布的任何有限子集的变化点估计的特征在于后一种制度下,这也产生渐近独立的这些估计。组合结果用于构建变点参数的渐进有效分量和同步置信区间。结果是建立在一个高维尺度下,允许减少跳跃的大小,在存在分歧的变化点的数量和次指数误差。它们在合成数据和智能手机的传感器测量结果上进行了说明,以进行活动识别。

英文摘要:

We consider the problem of constructing confidence intervals for the locations of change points in a high-dimensional mean shift model. To that end, we develop a locally refitted least squares estimator and obtain component-wise and simultaneous rates of estimation of the underlying change points. The simultaneous rate is the sharpest available in the literature by at least a factor of $\log p,$ while the component-wise one is optimal. These results enable existence of limiting distributions. Component-wise distributions are characterized under both vanishing and non-vanishing jump size regimes, while joint distributions for any finite subset of change point estimates are characterized under the latter regime, which also yields asymptotic independence of these estimates. The combined results are used to construct asymptotically valid component-wise and simultaneous confidence intervals for the change point parameters. The results are established under a high dimensional scaling, allowing for diminishing jump sizes, in the presence of diverging number of change points and under subexponential errors. They are illustrated on synthetic data and on sensor measurements from smartphones for activity recognition.

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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