eccc.estimation(a, A, B, R, dvar, model, method="BFGS")
a：initial values for constants (N \times 1)
A：initial values for an ARCH parameter matrix (N \times N)
B：initial values for a GARCH parameter matrix (N \times N)
R：initial values a constant conditional correlation matrix (N \times N)
dvar：a matrix of data used for (E)CCC-GARCH estimation (T \times N)
model：a character string describing the model. "diagonal" for the diagonal model and "extended" for the extended (full ARCH and GARCH parameter matrices) model
method a character string specifying the optimisation method in optim. There are three choices, namely,Nelder-Mead, BFGS (default) and CG.
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