The asymptotic equivalence between the iterated improved 2sls estimator and the 3sls estimator
证明，对方程组进行3SLS估计，等价于对每个方程做迭代2SLS估计并加入其他方程的残差，这一结果扩展了Telser（1964）的结论。
In this paper we show that the 3SLS estimator of a system of equations is asymptotically equivalent to an iterative 2SLS estimator applied to each equation, augmented with the residuals from the other equations. This result is a natural extension of Telser (1964).