lgarch (version 0.4)

coef.lgarch: Extraction methods for 'lgarch' objects

Description

Extraction methods for objects of class 'lgarch' (i.e. the result of estimating a log-GARCH model)

Usage

## S3 method for class 'lgarch':
coef(object, arma = FALSE, ...)
## S3 method for class 'lgarch':
fitted(object, verbose = FALSE, ...)
## S3 method for class 'lgarch':
logLik(object, arma = FALSE, ...)
## S3 method for class 'lgarch':
print(x, arma = FALSE, ...)
## informal method for class 'lgarch'
rss(object, ...)
## S3 method for class 'lgarch':
residuals(object, arma = FALSE, ...)
## S3 method for class 'lgarch':
vcov(object, arma = FALSE, ...)

Arguments

object

an object of class 'lgarch'

x

an object of class 'lgarch'

verbose

logical. If FALSE (default), then only basic information is returned

arma

logical. If FALSE (default), then information relating to the log-garch model is returned. If TRUE, then information relating to the ARMA representation is returned

...

additional arguments

Value

• coef:
  A numeric vector containing the parameter estimates
• fitted:
  A zoo object. If verbose = FALSE (default), then the zoo object is a vector containing the fitted conditional standard deviations. If verbose = TRUE, then the zoo object is a matrix containing the conditional standard deviations and additional information
• logLik:
  The value of the log-likelihood (contributions at zeros excluded) at the maximum
• print:
  Prints the most important parts of the estimation results
• residuals:
  A zoo object with the residuals. If arma = FALSE (default), then the standardised residuals are returned. If arma = TRUE, then the residuals of the ARMA representation is returned
• rss:
  A numeric; the Residual Sum of Squares of the ARMA representation
• vcov:
  The variance-covariance matrix

Details

Note: The rss function is not a formal S3 method.

See Also

lgarch

Examples

##simulate 500 observations w/default parameter values:
set.seed(123)
y <- lgarchSim(500)

##estimate a log-garch(1,1):
mymod <- lgarch(y)

##print results:
print(mymod)

##extract coefficients:
coef(mymod)

##extract Gaussian log-likelihood (zeros excluded) of the log-garch model:
logLik(mymod)

##extract the Residual Sum of Squares of the ARMA representation:
rss(mymod)

##extract log-likelihood (zeros excluded) of the ARMA representation:
logLik(mymod, arma=TRUE)

##extract variance-covariance matrix:
vcov(mymod)

##extract and plot the fitted conditional standard deviation:
sdhat <- fitted(mymod)
plot(sdhat)

##extract and plot standardised residuals:
zhat <- residuals(mymod)
plot(zhat)

##extract and plot all the fitted series:
myhat <- fitted(mymod, verbose=TRUE)
plot(myhat)