σ(t)^2=c+α_1*x(t-1)^2+α_2*y(t-1)^2+β*σ(t-1)^2
which c is a constant to estimate, α_1,a_2,β are to estimate.
x(t) y(t) are time-series variables and they are independent.
how estimate a simple multivariate garch mode like thisl?
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