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ASYMPTOTICS FOR GARCH SQUARED RESIDUAL CORRELATIONS
Published online by Cambridge University Press: 06 June 2003
Abstract
We develop an asymptotic theory for quadratic forms of the
autocorrelations of squared residuals from a
GARCH(p,q) model. Denoting by
,
k ≥ 1, these autocorrelations computed from a realization
of length n, we show that the statistic
is a matrix computed from the data, converges to the chi-square distribution
with K degrees of freedom for any 1 ≤ i1 <
··· < iK. Our
results are valid under weak assumptions on the innovations and model
coefficients that admit that arbitrary low-order moments of the
observations can be infinite. The matrix
and its asymptotic limit D depend on the distribution of the
innovations. A small simulation study illustrates the theory and shows, in
particular, that using the matrix D computed under the assumption of
normal innovations may lead to incorrect conclusions if the innovations have
a different distribution.We thank the two
referees for their comments and Professor Bruce E. Hansen, the co-editor
in charge, for his sound advice on how to improve the paper. The work of
István Berkes was supported by the Hungarian National Foundation for
Scientific Research, grant T 29621. The work of Lajos Horváth and
Piotr Kokoszka was supported by NATO grant PST.CLG.977607.
- Type
- Research Article
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- Copyright
- © 2003 Cambridge University Press
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