This function computes the analytical Hessian of the log-likelihood function of the (E)CCC-GARCH model.

1 | ```
analytical.Hessian(a, A, B, R, u, model)
``` |

`a` |
a vector of constants in the vector GARCH equation |

`A` |
an ARCH parameter matrix in the vector GARCH equation |

`B` |
a GARCH parameter matrix in the vector GARCH equation |

`R` |
a constant conditional correlation matrix |

`u` |
a matrix of the data data used for estimating the (E)CCC-GARCH(1,1) model |

`model` |
a character string describing the model. |

a *npar \times npar* Hessian matrix of the log-likelihood function of the (E)CCC-GARCH model

Nakatani, T. and T. Ter\"asvirta (2009),
“Testing for Volatility Interactions in the Constant Conditional Correlation GARCH Model”,
*Econometrics Journal*, **12**, 147–163.

Nakatani, T. and T. Ter\"asvirta (2008),
“Appendix to *Testing for Volatility Interactions in the Constant Conditional Correlation GARCH Model*”
Department of Economic Statistics, Stockholm School of Economics,
available at http://swopec.hhs.se/hastef/abs/hastef0649.htm.

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