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A general white noise test based on kernel lag-window estimates of the spectral density operator

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  • Characiejus, Vaidotas
  • Rice, Gregory

Abstract

A general white noise test for functional time series is considered. The idea of the test is to estimate a distance between the spectral density operator of a weakly stationary time series and the constant spectral density operator of an uncorrelated time series. The estimator of the distance is based on a kernel lag-window type estimator of the spectral density operator. When the observed time series is a strong white noise in a real separable Hilbert space, it is shown that the asymptotic distribution of the test statistic is standard normal, and it is further shown that the test statistic diverges for general serially correlated time series. These results recover as special cases some previous tests. In order to implement the test, a number of kernel and bandwidth choices is proposed and studied, including a new data adaptive bandwidth, as well as data adaptive power transformations of the test statistic that improve the normal approximation in finite samples. A simulation study demonstrated that the proposed method has good size and improved power when compared to other methods available in the literature, while also offering a light computational burden.

Suggested Citation

  • Characiejus, Vaidotas & Rice, Gregory, 2020. "A general white noise test based on kernel lag-window estimates of the spectral density operator," Econometrics and Statistics, Elsevier, vol. 13(C), pages 175-196.
    • Handle: RePEc:eee:ecosta:v:13:y:2020:i:c:p:175-196
    DOI: 10.1016/j.ecosta.2019.01.003
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    References listed on IDEAS

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    2. Axel Bücher & Holger Dette & Florian Heinrichs, 2023. "A portmanteau-type test for detecting serial correlation in locally stationary functional time series," Statistical Inference for Stochastic Processes, Springer, vol. 26(2), pages 255-278, July.

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