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- W1494825236 abstract "Recently, there has been an upsurge of interest on the possibility of confusing long memory and structural changes in level. Many studies have shown that when a stationary short memory process is contaminated by level shifts the estimate of the fractional differencing parameter is biased away from zero and the autocovariance function exhibits a slow rate of decay, akin to a long memory process. We analyze the properties of the log periodogram estimate of the memory parameter when the jump component is specified by a simple mixture model. Our theoretical results explain many findings reported and uncover new features. Simulations are presented to highlight the properties of the distributions and to assess the adequacy of our approximations. We also show the usefulness of our results to distinguish between long memory and level shifts via an application to the volatility of daily returns for wheat commodity futures." @default.
- W1494825236 created "2016-06-24" @default.
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- W1494825236 date "2007-10-01" @default.
- W1494825236 modified "2023-09-27" @default.
- W1494825236 title "An Analytical Evaluation of the Log-periodogram Estimate in the Presence of Level Shifts" @default.
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