buggnubg - Bugs: bug #49795, 'overall rating' statistic value...

 
 

bug #49795: 'overall rating' statistic value is low for short games, high for long games

Submitted by:  None
Submitted on:  Wed 07 Dec 2016 04:53:59 PM UTC  
 
Originator Name: Joseph McGinleyOriginator Email: -unavailable-
Item Group: Other bugCategory: Other
Release: 1.05-ReleasePrivacy: Public
Operating System: LinuxOS Type: 64Bit
Processor Type: IntelSeverity: 3 - Normal
Open/Closed: ClosedAssigned to: None
Priority: 5 - NormalStatus: Works For Me

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Wed 04 Jan 2017 05:19:58 PM UTC, comment #2:

I tried to confirm the bug by playing 10 short games and 2 long games.

To my surprise, I found no evidence for the bug.

I'm happy that this bug can be closed as 'not an issue' (or some such). Sorry for the dud.

Joseph

Anonymous
Tue 03 Jan 2017 09:43:22 PM UTC, comment #1:

The rating is derived from the error rates as described in this article :
http://people.cs.ubc.ca/~kvdoel/tmp/ratings/

There is no reason why it should be too low on average for shorter matches. On the other hand, the dispersion of results will be higher since errors will be averaged on a smaller number of moves.

If your "true" rating is 1800 and you play long matches deliberately, you may get most of your ratings between, say, 1750 and 1850. If you play shorter matches the proportion of ratings falling out of this interval will be significantly higher.

The rating formula is not perfect, but I don't think it has the kind on clear flaw you suggest. I set the status to "works for me" but won't close the bug before 10-15 days, in case you wish to comment further.

Philippe Michel <plm>
Project Member
Wed 07 Dec 2016 04:53:59 PM UTC, original submission:

I've noticed that when I play short games, my 'Overall Rating' at the end is often around 1600s, whereas when I play long games [15 or more] my Overall Rating is usually around 1800s. It feels like the rating is not calculated correctly.

Anonymous

 

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    Follow 2 latest changes.

    Date Changed By Updated Field Previous Value => Replaced By
    Thu 05 Jan 2017 09:27:07 PM UTCplmOpen/ClosedOpen=>Closed
    Tue 03 Jan 2017 09:43:21 PM UTCplmStatusNone=>Works For Me

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