申論題

Problem 23.(10%) For a simple linear regression model
Yᵢ = α + βXᵢ + εᵢ    i = 1,2,....., n
Where Yᵢ is the dependent variable in the iᵗʰ case, Xᵢ is the value of the independent variable in the iᵗʰ case and assumed to be a known constant, α and β are parameters, and εᵢ is the error term for the iᵗʰ case.

(B) Will the situation in ( A ) happen if the constant term α does not exist any more? This is,the simple regression model is formulated as Yᵢ = βXᵢ + εᵢ  i = 1,2,....., n. (3%)