为了证明ols估计量是渐近有效的，我们需要(1)给出一致的估计量但证明它有更大的方差。

To prove that OLS estimators are asymptotically efficient, one needs to (1) present an estimator that is consistent but its variance is larger.

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我们研究了这些方法的强相合性，渐近正态性和渐近有效性。

The strong consistency, asymptotic normality and asymptotic efficiency of these methods are proved.

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