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- W2079647269 abstract "We consider a unified least absolute deviation estimator for stationary and nonstationary fractionally integrated autoregressive moving average models with conditional heteroscedasticity. Its asymptotic normality is established when the second moments of errors and innovations are finite. Several other alternative estimators are also discussed and are shown to be less efficient and less robust than the proposed approach. A diagnostic tool, consisting of two portmanteau tests, is designed to check whether or not the estimated models are adequate. The simulation experiments give further support to our model and the results for the absolute returns of the Dow Jones Industrial Average Index daily closing price demonstrate their usefulness in modelling time series exhibiting the features of long memory, conditional heteroscedasticity and heavy tails." @default.
- W2079647269 created "2016-06-24" @default.
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- W2079647269 date "2008-02-04" @default.
- W2079647269 modified "2023-10-17" @default.
- W2079647269 title "Least absolute deviation estimation for fractionally integrated autoregressive moving average time series models with conditional heteroscedasticity" @default.
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- W2079647269 doi "https://doi.org/10.1093/biomet/asn014" @default.
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