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分类依据与纠错

AI 根据所提供的论文材料归类:摘要直接研究计数时间序列的动态建模,以及条件均值和方差预测。

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代码、数据与补充材料

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关注这篇论文的作者
Tianqing Liu
Xiaohui Yuan

采用 Laplace 链接函数的计数时间序列半参数均值与方差联合模型

研究问题
如何为计数时间序列分别建模条件均值与方差,使模型容纳更灵活的均值方差关系,以及负回归系数和负自相关?
方法与思路
作者提出随机舍入计数型 GARCH 模型及其变体,使用 Laplace 链接函数,并研究条件最小二乘估计与模型选择准则。
材料陈述的贡献
摘要称模型允许负系数与负自相关,建立平稳遍历性及估计量的一致性、渐近正态性,并以模拟和真实数据评估预测。
阅读关注点
核对随机舍入机制、均值方差可行范围、平稳遍历条件,以及与 ARMA 自相关结构对应时的系数限制和预测评价。
阅读边界
这是 arXiv 预印本,不能据此认定已通过同行评审或被期刊接收;摘要未给出链接函数形式、理论条件及预测误差数值。

原文摘要

Count time series data are frequently analyzed by modeling their conditional means and the conditional variance is often considered to be a deterministic function of the corresponding conditional mean and is not typically modeled independently. We propose a semiparametric mean and variance joint model, called random rounded count-valued generalized autoregressive conditional heteroskedastic (RRC-GARCH) model, to address this limitation. The RRC-GARCH model and its variations allow for the joint modeling of both the conditional mean and variance and offer a flexible framework for capturing various mean-variance structures (MVSs). One main feature of this model is its ability to accommodate negative values for regression coefficients and autocorrelation functions. The autocorrelation structure of the RRC-GARCH model using the proposed Laplace link functions with nonnegative regression coefficients is the same as that of an autoregressive moving-average (ARMA) process. For the new model, the stationarity and ergodicity are established and the consistency and asymptotic normality of the conditional least squares estimator are proved. Model selection criteria are proposed to evaluate the RRC-GARCH models. The performance of the RRC-GARCH model is assessed through analyses of both simulated and real data sets. The results indicate that the model can effectively capture the MVS of count time series data and generate accurate forecast means and variances.

笔记与分组