“…Denote the bivariate series of curves by and at t = 1, …, n . Chen, Chua, and Härdle (2019) proposed the vector FAR (VFAR) model of order p for the bivariate time series defined as: where ρ 11, k , ρ 12, k , ρ 21, k , ρ 22, k are the operators that show the serial cross‐dependence among the curves on their k th lagged values. Again, the operators are bounded linear operator from ℋ to ℋ.…”