cora | R Documentation |
This function computes the autocorrelation matrix for a given lag. For instance, it is used for estimating GO-GARCH models whence the method of moments is utilized.
cora(SSI, lag = 1, standardize = TRUE)
SSI |
Array with dimension |
lag |
Integer, the lag for which the autocorrelation is computed. |
standardize |
Logical, if |
This function computes the autocorrelation matrix according to:
\hat{Γ}_k (s) = \frac{1}{n} ∑_{t = k + 1}^n S_t S_{t-k}
\hat{Φ}_k (s) = \hat{Γ}_0 (s)^{-1/2} \hat{Γ}_k (s) \hat{Γ}_0 (s)^{-1/2}
It is computationally assured that \hat{Φ}_k (s) is symmetric by setting it equal to: \hat{Φ}_k (s) = \frac{1}{2}(\hat{Φ}_k (s) + \hat{Φ}_k (s)'). The standardization matrix \hat{Γ}_0 (s)^{-1/2} is derived from the singular value decomposition of the co-variance matrix at lag zero.
cora |
Matrix with dimension |
Bernhard Pfaff
Boswijk, H. Peter and van der Weide, Roy (2009), Method of Moments Estimation of GO-GARCH Models, Working Paper, University of Amsterdam, Tinbergen Institute and World Bank.
gogarch
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