2.220446e-16 ≈ 0 [Design Issues]

posted by PharmCat  – Russia, 2019-12-24 15:18 (1555 d 23:19 ago) – Posting: # 21025
Views: 5,500

❝ ❝ ❝ For observation 8 we have -3.608225e-16, I think,

❝ ❝ I think, is around the "effective zero" for fits in R at default settings on 64- and 32-bit systems.


Hi Helmut!

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.

Complete thread:

UA Flag
Activity
 Admin contact
22,957 posts in 4,819 threads, 1,639 registered users;
75 visitors (0 registered, 75 guests [including 8 identified bots]).
Forum time: 14:38 CET (Europe/Vienna)

Nothing shows a lack of mathematical education more
than an overly precise calculation.    Carl Friedrich Gauß

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