Inference on breaks in weak location time series models with the estimating function approach
基于估计函数的弱条件位置时间序列模型断点推断AI 解读 ↓
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基于估计函数的弱条件位置时间序列模型断点推断AI 解读 ↓
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Drawing on Godambe’s theory of estimating functions, we present a statistical approach for identifying breaks in time series dynamics under weak assumptions. We assume a parametric form for the conditional mean but make no specific assumptions about the data-generating process (DGP), nor about the other conditional moments. The cumulative sum (CUSUM) statistics and segmentation of minimal cost (SMC) statistics that we consider depend on a sequence of weights that influence their asymptotic accuracy. We propose data-driven procedures for the optimal choice of the sequence of weights in Godambe’s sense. We also study modified versions of the tests that can detect breaks in the dynamics even when the conditional mean is misspecified. Local asymptotic power comparisons with other tests are also proposed. Our results are illustrated using Monte Carlo experiments and real financial data.