14.1 Restricted Least Squares (RLS) 1. oLS and rls (1) Unrestricted least squares(ULS) When using the ordinary least square method(ols) to estimate the parameters we do not put any prior constraint(s)or restriction (s)on the parameters So we can estimate the parameters without any restrictions. This is Uls14.1 Restricted Least Squares（RLS） ◼ 1. OLS and RLS （1）Unrestricted least squares(ULS): When using the ordinary least square method(OLS) to estimate the parameters, we do not put any prior constraint（s）or restriction(s) on the parameters. So we can estimate the parameters without any restrictions. This is ULS