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Time series quantile regression kink with an unknown threshold

Author

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  • Feipeng Zhang
  • Rui Xie
  • Zhijie Xiao

Abstract

This article studies a time series quantile regression kink model with an unknown threshold over certain quantile levels in the distribution. We propose to estimate the threshold parameter and regression parameters using a two-stage method. We also propose a weighted CUSUM test for threshold effect at both a given quantile level and multiple quantile levels based on the subgradient of the quantile loss function. In addition, we consider a likelihood-ratio-type test for the presence of a common threshold value across different quantile levels. Excellent finite sample performance of the proposed method is demonstrated by simulation studies. We further apply our proposed method to the S & P500 index data to explore the possible nonlinearity and heteroscedasticity of the return autocorrelations in the S & P500 index.

Suggested Citation

  • Feipeng Zhang & Rui Xie & Zhijie Xiao, 2025. "Time series quantile regression kink with an unknown threshold," Econometric Reviews, Taylor & Francis Journals, vol. 44(9), pages 1275-1320, October.
  • Handle: RePEc:taf:emetrv:v:44:y:2025:i:9:p:1275-1320
    DOI: 10.1080/07474938.2025.2504110
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