Threshold Estimation via Group Orthogonal Greedy Algorithm
基于分组正交贪婪算法的阈值估计AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要明确研究非线性阈值自回归时间序列,并应用于美国 GNP,直接对应时间序列方向。
基于分组正交贪婪算法的阈值估计AI 解读 ↓
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A threshold autoregressive (TAR) model is an important class of nonlinear time series models that possess many desirable features such as asymmetric limit cycles and amplitude-dependent frequencies. Statistical inference for the TAR model encounters a major difficulty in the estimation of thresholds, however. This article develops an efficient procedure to estimate the thresholds. The procedure first transforms multiple-threshold detection to a regression variable selection problem, and then employs a group orthogonal greedy algorithm to obtain the threshold estimates. Desirable theoretical results are derived to lend support to the proposed methodology. Simulation experiments are conducted to illustrate the empirical performances of the method. Applications to U.S. GNP data are investigated.