# garch-methods

##### Methods for Fitted GARCH Models

Methods for fitted GARCH model objects.

##### Usage

```
# S3 method for garch
predict(object, newdata, genuine = FALSE, …)
# S3 method for garch
coef(object, …)
# S3 method for garch
vcov(object, …)
# S3 method for garch
residuals(object, …)
# S3 method for garch
fitted(object, …)
# S3 method for garch
print(x, digits = max(3, getOption("digits") - 3), …)
# S3 method for garch
plot(x, ask = interactive(), …)
# S3 method for garch
logLik(object, …)
```

##### Arguments

- object, x
an object of class

`"garch"`

; usually, a result of a call to`garch`

.- newdata
a numeric vector or time series to compute GARCH predictions. Defaults to

`eval(parse(text=object$series))`

.- genuine
a logical indicating whether a genuine prediction should be made, i.e., a prediction for which there is no target observation available.

- digits
see

`printCoefmat`

.- ask
Should the

`plot`

method work interactively? See`interactive`

.- …
further arguments passed to or from other methods.

##### Details

`predict`

returns +/- the conditional standard deviation
predictions from a fitted GARCH model.

`coef`

returns the coefficient estimates.

`vcov`

the associated covariance matrix estimate (outer product of gradients estimator).

`residuals`

returns the GARCH residuals, i.e., the time series
used to fit the model divided by the computed conditional standard
deviation predictions for this series. Under the assumption of
conditional normality the residual series should be i.i.d. standard
normal.

`fitted`

returns +/- the conditional standard deviation
predictions for the series which has been used to fit the model.

`plot`

graphically investigates normality and remaining ARCH
effects for the residuals.

`logLik`

returns the log-likelihood value of the GARCH(p, q)
model represented by `object`

evaluated at the estimated
coefficients. It is assumed that first max(p, q) values are fixed.

##### Value

For `predict`

a bivariate time series (two-column matrix) of
predictions.

For `coef`

, a numeric vector, for `residuals`

and
`fitted`

a univariate (vector) and a bivariate time series
(two-column matrix), respectively.

For `plot`

and `print`

, the fitted GARCH model object.

*Documentation reproduced from package tseries, version 0.10-47, License: GPL-2*