Show that Eq. (7.4.7) can also be expressed as where b 23 is the slope coefficient in
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where b23 is the slope coefficient in the regression of X2 on X3. Recall that b23 = Σx2ix3i / Σx23i.
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Ey,(x2 – b23x3i) E(x2; – b23x3)2 net (of x3) covariation between y and x2 net (of 3) variation in x2
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