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arXiv 1503.05130stat.ME
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关于函数数据均值变化的存在性

On existence of a change in mean of functional data

Buddhananda Banerjee, Satyaki Mazumder

摘要:

函数数据通常作为连续状态空间上的连续时间观测而出现。一组功能数据如果不考虑其结构可能发生的变化,可能会导致错误的结论。因此,有时,在进行任何进一步的统计推断之前,了解给定的函数数据序列中是否存在变点是至关重要的。我们开发了一种新的方法来提供一个测试,用于检测相应数据的平均函数的变化。为了获得检验统计量,我们提供了协方差核的另一种估计量。该估计在原假设下是渐近无偏的,同时比现有估计具有更小的偏差量。我们在这里表明,在原假设下,所提出的检验统计量是渐近关键的。此外,它表明,在备择假设的测试是一致的足够大的样本量。它也被发现,建议的测试是更强大的比现有的测试程序在文献中。从广泛的模拟研究中,我们观察到,拟议的测试优于现有的一个具有较宽的利润率的权力中等样本量。所开发的方法表现出令人满意的平均日温度的英格兰中部和每月全球平均气温异常。

英文摘要:

Functional data often arise as sequential temporal observations over a continuous state-space. A set of functional data with a possible change in its structure may lead to a wrong conclusion if it is not taken in to account. So, sometimes, it is crucial to know about the existence of change point in a given sequence of functional data before doing any further statistical inference. We develop a new methodology to provide a test for detecting a change in the mean function of the corresponding data. To obtain the test statistic we provide an alternative estimator of the covariance kernel. The proposed estimator is asymptotically unbiased under the null hypothesis and, at the same time, has smaller amount of bias than that of the existing estimator. We show here that under the null hypothesis the proposed test statistic is pivotal asymptotically. Moreover, it is shown that under alternative hypothesis the test is consistent for large enough sample size. It is also found that the proposed test is more powerful than the available test procedure in the literature. From the extensive simulation studies we observe that the proposed test outperforms the existing one with a wide margin in power for moderate sample size. The developed methodology performs satisfactorily for the average daily temperature of central England and monthly global average anomaly of temperatures.

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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