Charlect 13-2 Here are 3 important facts about OLS (Do not derive Then) 7. = 7+...
Charlect 13-2 Here are 3 important facts about OLS (Do not derive Then) 7. = 7+ Å xi to prediction agn. Slook back at our derivation Pe l lilu 30 gof The Normal equs of regression E EX, E 14 - 7:) x = 0 You'll see that this egn. is a sto This one is essentially SSE - How consider the following identity (That we used in leat): §14-7)= { [19:24+ (v-:)]? = 2. 19. 7) ²+ & (4. . . )² + 2 & (9.7) (4.9) Use the above 3 facts to show that the last term (cross-term) is zero