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Mikosch, Thomas; Starica, Catalin
The Annals of statistics, 10/2000, Letnik: 28, Številka: 5Journal Article
The asymptotic theory for the sample autocorrelations and extremes of a GARCH(1, 1) process is provided. Special attention is given to the case when the sum of the ARCH and GARCH parameters is close to 1, that is, when one is close to an infinite variance marginal distribution. This situation has been observed for various financial log-return series and led to the introduction of the IGARCH model. In such a situation, the sample auto-correlations are unreliable estimators of their deterministic counterparts for the time series and its absolute values, and the sample autocorrelations of the squared time series have nondegenerate limit distributions. We discuss the consequences for a foreign exchange rate series.
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