Temporal Aggregation of Garch Processes
The authors derive low frequency, say weekly, models implied by high frequency, say daily, ARMA models with symmetric GARCH errors. They show that low frequency models exhibit conditional heteroskedasticity of the GARCH form as well. The parameters in the conditional variance equation of the low frequency model depend upon mean, variance, and kurtosis parameters of the corresponding high frequency model. Moreover, strongly consistent estimators of the parameters in the high frequency model can be derived from low frequency data. The common assumption in applications that rescaled innovations are independent is disputable, since it depends upon the available data frequency. Copyright 1993 by The Econometric Society.
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| Length: | 21 pages |
| Date of creation: | 1992 |
| Date of revision: | |
| Handle: | RePEc:fth:tilbur:9240 |
| Contact details of provider: | Postal: TILBURG UNIVERSITY, CENTER FOR ECONOMIC RESEARCH, 5000 LE TILBURG THE NETHERLANDS. Phone: 31 13 4663050 Fax: 31 13 4663066 Web page: http://center.uvt.nl/ Email: More information through EDIRC
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