计量题目讨论（Wooldridge Econometric Analysis of Cross Section and Panel Data中的题目）

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2.4. For random scalars u and v and a random vector x, suppose that E(u| x, v) is a linear function of (x,v) and that u and v each have zero mean and are uncorrelated with the elements of x. Show that E(u| x, v)=E(u|v) =rv for some r. 题目在书中的28页

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关键词：Econometric panel data wooldridge Analysis Analysi Analysis Data Panel Section Cross

the kye is E(u| x, v)=E(u|v). it is meanthat info. mass of v is smaller than x, so the weak low is consist, so we get
E(u| x, v)=E(u|v)

And E(u| x, v) is a linear function of (x,v), so we get the conclution E(u|v)= rv fot some r