For a regression through the origin, state which of these statement is not true?
1
The \({\Sigma}\hat{u}_i\) need not be equal to zero.
2
The raw r2 computed satisfies 0 < r < 1 and is directly comparable to the conventionally complete.
3
In estimating the model, we use raw sum of squares and cross products.
4
The conventionally computed r2 may give negative value.