Question: Within 2SLS and Between 2SLS. Verify that GLS on (7.7) yields (7.6) and GLS on (7.9) yields (7.8), the Within 2SLS and Between 2SLS estimators

Within 2SLS and Between 2SLS. Verify that GLS on (7.7) yields (7.6) and GLS on (7.9) yields (7.8), the Within 2SLS and Between 2SLS estimators of $\delta_{1}$, respectively.

1,W2SLS = ( P) P (7.6)

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