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logreg
2013 Apr 08
0
Maximum likelihood estimation of ARMA(1,1)-GARCH(1,1)
...the GARCH(1,1) volatility model to a variety of
alternative specifications to capture the potential asymmetry for a
better comparison:
# GARCH(1,1), EGARCH(1,1), NGARCH(1,1), and TGARCH(1,1).
options(scipen=10)
intel= read.csv(file="intel.csv")
summary(intel)
raw_data= as.matrix(intel$logret)
library(fGarch)
garchFit(~arma(1,1)+garch(1,1), data=raw_data, trace=FALSE)
negative_log_likelihood_arma11_garch11=
function(theta, data)
{mean =theta[1]
delta=theta[2]
gamma=theta[3]
omega=theta[4]
alpha=theta[5]
beta= theta[6]
r= ts(data)
n= length(r)
u= vector(length=n)
u= ts(u)...