View Single Post
  #5  
Old 04-16-2012, 02:55 PM
htlin's Avatar
htlin htlin is offline
NTU
 
Join Date: Aug 2009
Location: Taipei, Taiwan
Posts: 601
Default Re: HW 2.8: Seeking clarification on simulated noise

Quote:
Originally Posted by sakumar View Post
Thank you both for that clarification. I believe I am inching closer to understanding noise.

I have some follow up questions: How is E_in defined? Do you compare the linear regression results (i.e. sign(w'x) where w is obtained by linear regression using the "noisy" y) to the true value of y or to the the noisy value from the training data?

In the real world, since the target function is unknown, the best one can do is E_in_estimated by comparing sign(w'x) to the "noisy" y. But in this instance we actually do have the target function. So if we are asked to compute E_in should we use the original y?

Edit: I tried both and the closest answer didn't change, but I'd still like to understand the correct definition of E_in.
You should compare to the noisy y that you have on hand. Hope this helps.
__________________
When one teaches, two learn.
Reply With Quote