ARCH and Bilinear Time Series Models: Comparison and Combination
- 1 January 1986
- journal article
- research article
- Published by Taylor & Francis in Journal of Business & Economic Statistics
- Vol. 4 (1) , 59-70
- https://doi.org/10.1080/07350015.1986.10509494
Abstract
Two extensions to the ARMA model, bilinearity and ARCH errors are compared, and their combination is considered. Starting with the ARMA model, tests for each extension are discussed, along with various least squares and maximum likelihood estimates of the parameters and tests of the estimated models based on these. The effects each may have on the identification, estimation, and testing of the other are given, and it is seen that to distinguish between the two properly, it is necessary to combine them into a bilinear model with ARCH errors. Some consequences of the misspecification caused by considering only the ARMA model are noted, and the methods are applied to two real time series.Keywords
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