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arXiv 2402.02664stat.ME
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广义整数自回归过程的统计推断

Statistical Inference for Generalized Integer Autoregressive Processes

Pashmeen Kaur, Peter F. Craigmile

AI总结:

本文系统研究广义整数自回归GINAR(p)过程的统计推断与预测方法,总结渐近性质并通过模拟比较小样本表现,最后应用于疾病监测数据。

摘要:

广义整数自回归过程(GINAR($p$))是一种流行且灵活的计数时间序列模型。这些马尔可夫过程通过使用作用于过程过去值的稀疏算子以及离散取值的创新过程来定义。该类别包括常用的INAR($p$)过程,其由二项稀疏和泊松创新定义。GINAR过程可应用于多种场景,包括对低计数时间序列建模,并允许更一般的均值-方差关系,从而捕捉过度离散或欠离散现象。尽管文献中给出了许多稀疏算子和创新过程,但较少关注比较不同GINAR过程选择下的统计推断和预测程序。我们对可应用于具有一般稀疏和创新参数的广泛GINAR($p$)过程的精确和近似推断及预测方法进行了广泛研究。我们讨论了当$p$较大时精确估计的挑战。我们总结并扩展了过程参数估计量的渐近结果,并进行了模拟以比较小样本性能,突出不同方法的比较情况。我们通过将GINAR过程拟合到疾病监测序列来说明该方法。

英文摘要:

A popular and flexible time series model for counts is the generalized integer autoregressive process of order $p$, GINAR($p$). These Markov processes are defined using thinning operators evaluated on past values of the process along with a discretely-valued innovation process. This class includes the commonly used INAR($p$) process, defined with binomial thinning and Poisson innovations. GINAR processes can be used in a variety of settings, including modeling time series with low counts, and allow for more general mean-variance relationships, capturing both over- or under-dispersion. While there are many thinning operators and innovation processes given in the literature, less focus has been spent on comparing statistical inference and forecasting procedures over different choices of GINAR process. We provide an extensive study of exact and approximate inference and forecasting methods that can be applied to a wide class of GINAR($p$) processes with general thinning and innovation parameters. We discuss the challenges of exact estimation when $p$ is larger. We summarize and extend asymptotic results for estimators of process parameters, and present simulations to compare small sample performance, highlighting how different methods compare. We illustrate this methodology by fitting GINAR processes to a disease surveillance series.

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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