Thread: Exercise 3.4 View Single Post
#11
10-07-2013, 09:27 AM
 magdon RPI Join Date: Aug 2009 Location: Troy, NY, USA. Posts: 597
Re: Exercise 3.4

is not , but that is close. Recall

Quote:
 Originally Posted by aaoam I'm having a bit of difficulty with 3.4b. I take \hat(y) - y and multiply by (XX^T)^{-1}XX^T, which ends up reducing the expression to just H\epsilon. However, then I can't use 3.3c in simplifying 3.3c, which makes me think I did something wrong. Can somebody give me a pointer? Also, it'd be great if there was instructions somewhere about how to post in math mode. Perhaps I just missed them?
__________________
Have faith in probability