Testing for threshold effects in the TARMA framework
TARMA 框架中的门槛效应检验AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要明确比较线性 ARMA 与门槛 ARMA 时间序列模型;门槛非线性并不直接等同于所列结构变化方向的时间变点。
TARMA 框架中的门槛效应检验AI 解读 ↓
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We present supremum Lagrange Multiplier tests to compare a linear ARMA specification against its threshold ARMA extension. We derive the asymptotic distribution of the test statistics both under the null hypothesis and contiguous local alternatives. Moreover, we prove the consistency of the tests. The Monte Carlo study shows that the tests enjoy good finite-sample properties, are robust against model mis-specification and their performance is not affected if the order of the model is unknown. The tests present a low computational burden and do not suffer from some of the drawbacks that affect the quasi-likelihood ratio setting. Lastly, we apply our tests to a time series of standardized tree-ring growth indexes and this can lead to new research in climate studies.