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ROBUST TESTS FOR WHITE NOISE AND CROSS-CORRELATION
Published online by Cambridge University Press: 21 September 2020
Abstract
Commonly used tests to assess evidence for the absence of autocorrelation in a univariate time series or serial cross-correlation between time series rely on procedures whose validity holds for i.i.d. data. When the series are not i.i.d., the size of correlogram and cumulative Ljung–Box tests can be significantly distorted. This paper adapts standard correlogram and portmanteau tests to accommodate hidden dependence and nonstationarities involving heteroskedasticity, thereby uncoupling these tests from limiting assumptions that reduce their applicability in empirical work. To enhance the Ljung–Box test for non-i.i.d. data, a new cumulative test is introduced. Asymptotic size of these tests is unaffected by hidden dependence and heteroskedasticity in the series. Related extensions are provided for testing cross-correlation at various lags in bivariate time series. Tests for the i.i.d. property of a time series are also developed. An extensive Monte Carlo study confirms good performance in both size and power for the new tests. Applications to real data reveal that standard tests frequently produce spurious evidence of serial correlation.
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- Information
- Econometric Theory , Volume 38 , Issue 5: YALE 2018 CONFERENCE IN HONOR OF PETER C. B. PHILLIPS: PART I , October 2022 , pp. 913 - 941
- Copyright
- © The Author(s), 2020. Published by Cambridge University Press
Footnotes
Dalla acknowledges financial support from ELKE-EKPA. Phillips acknowledges support from the Kelly Fund at the University of Auckland, a KLC Fellowship at Singapore Management University, and the NSF under Grant No. SES 18-50860.
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