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• W2182576985 abstract "We investigate the time-varying ARCH (tvARCH) process. It is shown that it can be used to describe the slow decay of the sample autocorrelations of the squared returns often observed in financial time series, which warrants the further study of parameter estimation methods for the model. Since the parameters are changing over time, a successful estimator needs to perform well for small samples. We propose a kernel normalised-least-squares (kernel-NLS) estimator which has a closed form, and thus outperforms the previously proposed kernel quasimaximum likelihood (kernel-QML) estimator for small samples. The kernel-NLS estimator is simple, works under mild moment assumptions, and avoids some of the parameter space restrictions imposed by the kernel-QML estimator. Theoretical evidence shows that the kernel-NLS estimator has the same rate of convergence as the kernelQML estimator. Due to the kernel-NLS estimator’s ease of computation, computationally intensive procedures can be used. A predictionbased cross-validation method is proposed for selecting the bandwidth of the kernel-NLS estimator. Also, we use a residual-based bootstrap scheme to bootstrap the tvARCH process. The bootstrap sample is used to obtain pointwise confidence intervals for the kernelNLS estimator. It is shown that distributions of the estimator using the bootstrap and the “true” tvARCH estimator asymptotically coincide." @default.
• W2182576985 created "2016-06-24" @default.
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• W2182576985 date "2007-01-01" @default.
• W2182576985 modified "2023-09-27" @default.
• W2182576985 title "NORMALISED LEAST-SQUARES ESTIMATION IN TIME-VARYING ARCH MODELS: TECHNICAL REPORT" @default.
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