GARCH.model defines an GARCH model as input for the
argument user of tsgui
Usage
GARCH.model(a.max=3, b.max=3)
Arguments
a.max,b.max
non-negative integer.
Any GARCH(p,q) model can be modelled in the gui
with \(p \le\)a.max and \(q \le\)b.max.
Note that a.max + b.max should not be larger than
6. Otherwise gui cannot manage the abundance of parameters.