[R] fGarch: garchFit() with fixed coefficents

[georger2]

hello everybody,

I would like to fit a model to a times series (testing set) for out of
sample predictions  using garchFit(). I would like to keep the coefficients
of ARMA/GARCH model fixed (as found by fitting the model to my training
set). The arima fitting function has such an option for that (fixed=NULL)
but the garchFit() doesnt. 

It is very important for me to keep the same coefficients for my testing set
as for my training set (where the model is found) in order to make out of
sample predictions for a new set ( testing set) using the same model found
for my training set. So basically what I would like is to fit an ARMA-GARCH
model but with predetermined coefficients. If you have any ideas please
share them with me...I will be very grateful.


Thanks,
G
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