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arXiv 0802.0523stat.MEmath.STstat.TH
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一阶移动平均线最大值的分布:连续情形

The distribution of the maximum of a first order moving average: the continuous case

Christopher S. Withers, Saralees Nadarajah

摘要:

我们给分布的$M_n$,最大的序列的$n$观察从一个移动平均的顺序1。首先给出的解决方案,在重复积分,然后为的情况下,基本的独立随机变量有一个绝对连续的密度。当相关性为正时,$$ P(M_n %\max^n_{i=1} X_i \leq x) =\ \sum_{j=1}^\infty β_{jx} ν_{jx}^{n} \approx B_{x} ν_{1x}^{n} $$其中% $\{X_i\}$是具有正相关性的1阶移动平均值,并且$\{ν_{jx}\}$是Fredholm核的特征值(奇异值),并且$ν_{1x}$是最大幅度的特征值。当相关性为负时,给出了类似的结果。结果类似于估计的大偏差展开,因为最大值不需要标准化以具有极限。对于连续的情况,将左、右特征函数的积分方程转化为一阶线性微分方程。对于给定矩阵的某些已知权重$\{w_i\}$和特征值$\{θ_i\}$,特征值满足形式为$$\sum_{i=1}^\infty w_i(λ-θ_i)^{-1}=λ-θ_0$$的方程。这可以通过将和截断为越来越多的项来解决。

英文摘要:

We give the distribution of $M_n$, the maximum of a sequence of $n$ observations from a moving average of order 1. Solutions are first given in terms of repeated integrals and then for the case where the underlying independent random variables have an absolutely continuous density. When the correlation is positive, $$ P(M_n %\max^n_{i=1} X_i \leq x) =\ \sum_{j=1}^\infty β_{jx} ν_{jx}^{n} \approx B_{x} ν_{1x}^{n} $$ where %$\{X_i\}$ is a moving average of order 1 with positive correlation, and $\{ν_{jx}\}$ are the eigenvalues (singular values) of a Fredholm kernel and $ν_{1x}$ is the eigenvalue of maximum magnitude. A similar result is given when the correlation is negative. The result is analogous to large deviations expansions for estimates, since the maximum need not be standardized to have a limit. % there are more terms, and $$P(M_n <x) \approx B'_{x}\ (1+ν_{1x})^n.$$ For the continuous case the integral equations for the left and right eigenfunctions are converted to first order linear differential equations. The eigenvalues satisfy an equation of the form $$\sum_{i=1}^\infty w_i(λ-θ_i)^{-1}=λ-θ_0$$ for certain known weights $\{w_i\}$ and eigenvalues $\{θ_i\}$ of a given matrix. This can be solved by truncating the sum to an increasing number of terms.

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