Hi I tried to run the following and it keeps giving me the following. Can somebody help me fix it.

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Solomon Gofere
Solomon Gofere 2014-9-19
评论： Solomon Gofere 2014-9-19
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%Question # 1D
alpha=1 beta=2 sigma=2 BetaOLS_Vector=ones(1000,2) for i=1:1000 x=normrnd(2,1,[200,1]); e=normrnd(0,sigma,[200,1]); y=alpha + beta*x +e(i); Con=ones(200,1); xn=[Con x]; BetaOLS_Vector(i)= inv(xn'*xn)*xn'*y end
In an assignment A(I) = B, the number of elements in B and I must be the same.
Error in ProblemTwoQuestionOne (line 16) BetaOLS_Vector(i)= inv(xn'*xn)*xn'*y

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采纳的回答

Roger Stafford
Roger Stafford 2014-9-19
The problem here is that inv(xn'*xn)*xn'*y has two elements in a size 2 x 1 vector, while you are trying to place them in a single element position in BetaOLS_Vector(i). Matlab doesn't like that.
Probably you mean this:
BetaOLS_Vector(i,:)= inv(xn'*xn)*xn'*y;

更多回答（1 个）

Image Analyst
Image Analyst 2014-9-19
BetaOLS_Vector(i must be a single number. Evidently inv(xn'*xn)*xn'*y is not a single number. Check the dimensions of xn and y and make sure it works out to a scalar.

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