Model Estimation In our course,we mainly concentrate on the least-squares(LS)error criterion The estimation of all-pole(AP)model leads to linear optimization problems,which is what we like. The estimation of all-zero(AZ)and PZ models requires the solutions to nonlinear optimization problems,which is generally troublesome. 9 9 In our course, we mainly concentrate on the least-squares (LS) error criterion • The estimation of all-pole (AP) model leads to linear optimization problems, which is what we like. • The estimation of all-zero (AZ) and PZ models requires the solutions to nonlinear optimization problems, which is generally troublesome. Model Estimation