
GARCH回归在R语言中进行。
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The model configuration involves specifying a GARCH model with order (1, 1), utilizing a normal distribution, and incorporating external regressors as NULL. Furthermore, the data’s time series characteristics are assessed using a normal distribution model within the ugarchfit function, employing the ‘solnp’ solver and associated control parameters. A specification, ‘myspec’, is defined incorporating a sGARCH variance model with order (1, 1) and an ARMA mean model of order (1, 1) including a mean term. The ugarchfit function is then applied to this specification with the provided data ‘datax’, again utilizing the ‘solnp’ solver. To extract results from the rugarch package, functions such as as.data.frame are employed to access fitted values, residuals, and sigma values from the fit object. Diagnostic plots can be generated using plot(myfit) to visually assess model performance. For forecasting future values beyond the observed data, the ugarchforcast function is utilized, specifying a forecast horizon of 20 periods. Prior to analysis, libraries like zoo, xts, timeSeires and others are leveraged for time series data preprocessing and manipulation. Unit root tests are conducted using packages such as urca and tseries to ensure stationarity of the time series data; ARMA models are implemented using fArma; GARCH models are built utilizing fGarch; and gls functions from nlme can be used for statistical modeling.
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