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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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In the spatial econometrics literature, spatial error dependence is characterized by spatial autoregressive processes, which relate every observation in the cross-section to any other with distance-decaying intensity: i.e., dependence obeys Tobler's First Law of Geography ('everything is related...
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