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

1 view (last 30 days)
close all clear all
%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

Accepted Answer

Roger Stafford
Roger Stafford on 19 Sep 2014
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;

More Answers (1)

Image Analyst
Image Analyst on 19 Sep 2014
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.

Categories

Find more on Loops and Conditional Statements in Help Center and File Exchange

Tags

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!