Sum of residuals ~ ε [Design Issues]

posted by Helmut Homepage – Vienna, Austria, 2019-12-24 14:54 (481 d 07:02 ago) – Posting: # 21026
Views: 3,371

Hi PharmCat

» I suppose hat this value come from QR decomposition with pivoting of rank deficient X matrix. So real value = 0. Can residual of random variable be equal zero? - No => bias.

I disagree. In the model ε = 0. However in the fit, the sum of residuals is only asymptotically 0. We shouldn’t speak of bias when we obtain something sufficiently close to the numeric resolution of the machine.

Dif-tor heh smusma 🖖
Helmut Schütz
[image]

The quality of responses received is directly proportional to the quality of the question asked. 🚮
Science Quotes

Complete thread:

Activity
 Admin contact
21,419 posts in 4,475 threads, 1,508 registered users;
online 17 (0 registered, 17 guests [including 5 identified bots]).
Forum time: Sunday 22:56 CEST (Europe/Vienna)

Nothing fails like success because you do not learn anything from it.
The only thing we ever learn from is failure.
Success only confirms our superstitions.    Kenneth E. Boulding

The Bioequivalence and Bioavailability Forum is hosted by
BEBAC Ing. Helmut Schütz
HTML5