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arXiv 2406.15907math.PRmath.STstat.TH
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张量 Curie-Weiss Potts 模型中磁化强度的收敛速率

Rates of Convergence of the Magnetization in the Tensor Curie-Weiss Potts Model

Sanchayan Bhowal, Somabha Mukherjee

AI总结:

本文研究张量 Curie-Weiss Potts 模型,建立磁化向量在不同相中的 Berry-Esseen 型收敛速率,并据此推导逆温度最大伪似然估计量的收敛界。

摘要:

本文推导了张量 Curie-Weiss Potts 模型中磁化向量以及逆温度参数的最大伪似然估计量的分布收敛速率。Bhowal 和 Mukherjee(2023)最近已经推导了磁化向量的极限定理,其中根据真实参数在参数空间中的位置,建立了以(中心化)磁化强度的尺度及其渐近分布表示的若干相变现象。在当前工作中,我们建立了磁化向量的 Berry-Esseen 型结果,明确了其在这些不同相中的收敛速率。在参数空间的大多数点上,该速率为 $N^{-1/2}$(其中 $N$ 是 Curie-Weiss 网络的规模),而在某些“特殊”点上,速率为 $N^{-1/4}$ 或 $N^{-1/6}$,这取决于某个“负自由能函数”的四阶导数在这些特殊点处的行为。随后,这些结果被用于在逆温度参数高于某个临界阈值时,推导其最大伪似然估计量的 Berry-Esseen 型界。

英文摘要:

In this paper, we derive distributional convergence rates for the magnetization vector and the maximum pseudolikelihood estimator of the inverse temperature parameter in the tensor Curie-Weiss Potts model. Limit theorems for the magnetization vector have been derived recently in Bhowal and Mukherjee (2023), where several phase transition phenomena in terms of the scaling of the (centered) magnetization and its asymptotic distribution were established, depending upon the position of the true parameters in the parameter space. In the current work, we establish Berry-Esseen type results for the magnetization vector, specifying its rate of convergence at these different phases. At most points in the parameter space, this rate is $N^{-1/2}$ ($N$ being the size of the Curie-Weiss network), while at some "special" points, the rate is either $N^{-1/4}$ or $N^{-1/6}$, depending upon the behavior of the fourth derivative of a certain "negative free energy function" at these special points. These results are then used to derive Berry-Esseen type bounds for the maximum pseudolikelihood estimator of the inverse temperature parameter whenever it lies above a certain criticality threshold.

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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