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A key application of long memory time series models concerns inflation. Long memory implies that shocks have a long … such level shifts are not unlikely for inflation, where the shifts may be caused by sudden oil price shocks, we examine … exaggerated. Our main findings are that apparent longmemory is quite resistant to level shifts, although for a few inflation rates …
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We propose a simple test on structural change in long-range dependent time series. It is based on the idea that the test statistic of the standard CUSUM test retains its asymptotic distribution if it is applied to fractionally differenced data. We prove that our approach is asymptotically valid...
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In this paper, we propose an Adaptive Hyperbolic EGARCH (A-HYEGARCH) model to estimate the long memory of high frequency time series with potential structural breaks. Based on the original HYGARCH model, we use the logarithm transformation to ensure the positivity of conditional variance. The...
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This paper studies long economic series to assess the long-lasting effects of pandemics. We analyze if periods that cover pandemics have a change in trend and persistence in growth, and in level and persistence in unemployment. We find that there is an upward trend in the persistence level of...
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