Inference for the panel ARMA-GARCH model when both $N$ and $T$ are large
个体数与时间长度均较大时的面板 ARMA-GARCH 模型推断AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要明确研究具有个体与时间维度的面板数据,并以 ARMA-GARCH 描述动态。
个体数与时间长度均较大时的面板 ARMA-GARCH 模型推断AI 解读 ↓
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We propose a panel ARMA-GARCH model to capture the dynamics of large panel data with $N$ individuals over $T$ time periods. For this model, we provide a two-step estimation procedure to estimate the ARMA parameters and GARCH parameters stepwisely. Under some regular conditions, we show that all of the proposed estimators are asymptotically normal with the convergence rate $(NT)^{-1/2}$, and they have the asymptotic biases when both $N$ and $T$ diverge to infinity at the same rate. Particularly, we find that the asymptotic biases result from the fixed effect, estimation effect, and unobservable initial values. To correct the biases, we further propose the bias-corrected version of estimators by using either the analytical asymptotics or jackknife method. Our asymptotic results are based on a new central limit theorem for the linear-quadratic form in the martingale difference sequence, when the weight matrix is uniformly bounded in row and column. Simulations and one real example are given to demonstrate the usefulness of our panel ARMA-GARCH model.