Which of the following estimation techniques could be employed for the estimation of over-identified systems of simultaneous equations?
(a) Ordinary Least Squares
(b) Two-stage Least Squares
(c) Indirect Least Squares
(d) Instrumental Variable Method
1
(b) only
2
(b), (c) and (d) only
3
(b) and (d) only
4
(a), (b), (c) and (d)