create_Fi_matrix function generates a \((T_obs \times T_obs)\) matrix
with 1's on the (i+1)-th sub-diagonal and 0's elsewhere.
create_Fi_matrix(i, T_obs)A \((T_obs \times T_obs)\) matrix with 1's on the (i+1)-th sub-diagonal and 0's elsewhere.
Integer, the lag for which the matrix is constructed, corresponding to the sub-diagonal filled with 1's.
Integer, the number of time periods or observations in the dataset, corresponding to the dimensions of the matrix.
Used in Portmanteau_test. The matrix \(F_i\) in Lütkepohl (2005), p.158.
Lütkepohl, H. (2005). New Introduction to Multiple Time Series Analysis. Springer.