acf - autocorrelation function
arma2param - explodes a Varmax model for estimation uses
arma_dv - Computes the partial derivatives in a VARMA model
pacf - Partial autocorrelation function
theta2arm2 - transformation of VARMA estimate into the corresponding matrices
theta2arma - transformation of VARMA model into its reduced form
varma - estimation of a (V)ARMA(X) model