dorsal/arxiv
View SchemaLong-term Memory and Volatility Clustering in Daily and High-frequency Price Changes
| Authors | GabJin Oh, Cheol-Jun Um, Seunghwann Kim |
|---|---|
| Categories | |
| ArXiv ID | physics/0601174 |
| URL | https://arxiv.org/abs/physics/0601174 |
Abstract
We study the long-term memory in diverse stock market indices and foreign exchange rates using the Detrended Fluctuation Analysis(DFA). For all daily and high-frequency market data studied, no significant long-term memory property is detected in the return series, while a strong long-term memory property is found in the volatility time series. The possible causes of the long-term memory property are investigated using the return data filtered by the AR(1) model, reflecting the short-term memory property, and the GARCH(1,1) model, reflecting the volatility clustering property, respectively. Notably, we found that the memory effect in the AR(1) filtered return and volatility time series remains unchanged, while the long-term memory property either disappeared or diminished significantly in the volatility series of the GARCH(1,1) filtered data. We also found that in the high-frequency data the long-term memory property may be generated by the volatility clustering as well as higher autocorrelation. Our results imply that the long-term memory property of the volatility time series can be attributed to the volatility clustering observed in the financial time series.
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"abstract": "We study the long-term memory in diverse stock market indices and foreign\nexchange rates using the Detrended Fluctuation Analysis(DFA). For all daily and\nhigh-frequency market data studied, no significant long-term memory property is\ndetected in the return series, while a strong long-term memory property is\nfound in the volatility time series. The possible causes of the long-term\nmemory property are investigated using the return data filtered by the AR(1)\nmodel, reflecting the short-term memory property, and the GARCH(1,1) model,\nreflecting the volatility clustering property, respectively. Notably, we found\nthat the memory effect in the AR(1) filtered return and volatility time series\nremains unchanged, while the long-term memory property either disappeared or\ndiminished significantly in the volatility series of the GARCH(1,1) filtered\ndata. We also found that in the high-frequency data the long-term memory\nproperty may be generated by the volatility clustering as well as higher\nautocorrelation. Our results imply that the long-term memory property of the\nvolatility time series can be attributed to the volatility clustering observed\nin the financial time series.",
"arxiv_id": "physics/0601174",
"authors": [
"GabJin Oh",
"Cheol-Jun Um",
"Seunghwann Kim"
],
"categories": [
"physics.soc-ph",
"q-fin.ST"
],
"title": "Long-term Memory and Volatility Clustering in Daily and High-frequency Price Changes",
"url": "https://arxiv.org/abs/physics/0601174"
},
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