Bootstrapping Stationary ARMA-GARCH Models By Kenichi Shimizu - ISBN:3834809926

Bootstrapping Stationary ARMA-GARCH Models By Kenichi Shimizu

Date: 21 November 2010, 06:39

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Bootstrap technique is a useful tool for assessing uncertainty in statistical estimation and thus it is widely applied for risk management. Bootstrap is without doubt a promising technique, however, it is not applicable to all time series models. A wrong application could lead to a false decision to take too much risk.
Kenichi Shimizu investigates the limit of the two standard bootstrap techniques, the residual and the wild bootstrap, when these are applied to the conditionally heteroscedastic models, such as the ARCH and GARCH models. The author shows that the wild bootstrap usually does not work well when one estimates conditional heteroscedasticity of Engle's ARCH or Bollerslev's GARCH models while the residual bootstrap works without problems. Simulation
studies from the application of the proposed bootstrap methods are demonstrated together with the theoretical investigation.
Contents
1 Introduction 1
1.1 FinancialTimeSeries and theGARCHModel . . . . . . . . . . . 1
1.2 The Limit of the Classical Statistical Analysis . . . . . . . . . 3
1.3 An Alternative Approach: the Bootstrap Techniques . . . 5
1.4 Structure of theBook . . . . . . . . . . . . . . . . . . . ....... . . . . 7
2 Bootstrap Does not Always Work 9
2.1 Estimation of Heteroscedasticity and Bootstrap .. . . . . . 10
2.2 Resultof aFalseApplication: theVaRModel . . . . . . . . . . . 13
3 Parametric AR(p)-ARCH(q) Models 19
3.1 EstimationTheory . . . . . . . . . . . . . . . . . . ........ . . . . . . 19
3.2 ResidualBootstrap . . . . . . . . . . . . . . . . . . . . . . . . . 37
3.3 WildBootstrap . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
3.4 Simulations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
4 Parametric ARMA(p, q)- GARCH(r, s) Models 65
4.1 EstimationTheory . . . . . . . . . . . . . . . . . . . . . . . . . 65
4.2 ResidualBootstrap . . . . . . . . . . . . . . . . . . . . . . . . . 68
4.3 WildBootstrap . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
4.4 Simulations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
5 Semiparametric AR(p)-ARCH(1) Models 85
5.1 EstimationTheory . . . . . . . . . . . . . . . . . . . . . . . . . 85
5.2 ResidualBootstrap . . . . . . . . . . . . . . . . . . . . . . . . . 98
5.3 WildBootstrap . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
5.4 Simulations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
Appendix 121
A Central Limit Theorems 123
B Miscellanea 125

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