Method for a Portmanteau test of the null hypothesis of no remaining correlation in the co-variances of the estimated BEKK residuals.
portmanteau.test(x, lags = 5)
Returns an Object of class "htest" containing the p-value and test statistic.
An object of class "bekkFit" from function bekk_fit.
An integer defining the lag length.
Here, the multivariate Portmanteau test of Hosking (1980) is implemented.
J. R. M. Hosking (1980). The Multivariate Portmanteau Statistic, Journal of the American Statistical Association, 75:371, 602-608.