Codeforces Round #480 (Div. 2) — thoughts about rating

Revision en1, by WasylF, 2018-05-10 13:43:38

Hi there! Rules of div 2 only contests were updated recently (allowing to participate purple in div 2 only rounds). I'm curious does this have an influence on the rating system. So. I've split all participants of this round by divisions and calculated rating change for them independently. You could find this results via following links: div1 only, div2 only. .

Let's define average rating change in the division as a sum of all rating changes of each contestant from this division divided by the number of participants in this division.

Division Average rating change
div. 1 only -8.09
div. 2 only -10.68

Let's calculate average rating change for the official result (rating calculates without separating by divisions)

Division Average rating change
div. 1 +3.86
div. 2 -12.21
both -10.81

As we can see, in combined round average purple contestants gain almost 12 additional rating points. In my opinion, this is quite unfair. Your thoughts?

Tags #rating, rating system, cf-predictor

History

 
 
 
 
Revisions
 
 
  Rev. Lang. By When Δ Comment
en1 English WasylF 2018-05-10 13:43:38 1278 Initial revision for English translation
ru6 Russian WasylF 2018-05-10 01:41:43 154 (опубликовано)
ru5 Russian WasylF 2018-05-10 01:31:51 64
ru4 Russian WasylF 2018-05-10 01:23:46 556
ru3 Russian WasylF 2018-05-10 01:11:07 174
ru2 Russian WasylF 2018-05-10 01:06:13 491
ru1 Russian WasylF 2018-05-09 23:58:23 398 Первая редакция (сохранено в черновиках)