Question: Show (2.47)-(2.48), namely that for d() E h m(X)X0 2 i then argmin b2Rk d (b) E X X01

Show (2.47)-(2.48), namely that for d(¯) Æ E h¡

m(X)¡X0¯

¢2 i

then

¯ Æ argmin b2Rk d

(b) Æ

¡

E

£

X X0¤¢¡1 E[Xm(X)] Æ

¡

E

£

X X0¤¢¡1 E[XY ] .

Hint: To show E[Xm(X)] Æ E[XY ] use the law of iterated expectations.

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