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We propose extensions of the Box-Pierce (1970) portmanteau autocorrelation test to allow for two generalisations: (i …) time series that exhibit unconditional heteroskedasticity and (ii) to test for the presence of autocorrelation only after a … autocorrelation consistent (HAC)-type estimator. While we show this modified test is robust to unconditional heteroskedasticity, the …
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A limit theory is developed for mildly explosive autoregressions under stationary (weakly or strongly dependent …. These effects are cancelled out in least squares regression theory and thereby the Cauchy limit theory of Phillips and …
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