Hello,
I have a VAR-BEKK-GARCH project. First, I run the VAR() function on var package to make a VAR model for 2-time-series data and getting the residuals matrix from it. After that, I use BEKK11() function on mts package for making the BEKK(1,1) model but I getting the error
Error in solve.default(Hessian) :
Lapack routine dgesv: system is exactly singular: U[1,1] = 0
What should I do?
Thanks.