vb.org Archive - Major Additions - Forum Tournaments & Ladders

Something doesn't seem right with the ELO calculator:
http://forum.ottawagolf.com/ladders.php?do=elorating

No matter what the score is, the resulting ratings are always the same if the beginning ratings are the same and the winner of the match is the same.

Also, the larger the margin of difference is between opponents is the less gain a winning underdog gets. Example:
If a 1000 beats a 1001 the resulting ratings are 1024.92(winner) and 988.46(loser)
If a 1000 beats a 1030 the resulting ratings are 1022.84(winner) and 1016.42(loser)
and so on up to 1000 beating 2000 resulting in ratings of 1000.15 (winner) and 1975.07(loser)
Shouldn't beating a better opponent result in a higher rating than beating a lesser opponent?
Something just seems wrong with this calculator to me.

Elo rating calculator is wrong. The formula is incorrect - it has yet to be updated to latest one.

bananalive

06-26-2009 09:52 AM

Quote:

Originally Posted by vash911 (Post 1835827)

Is there an error with the Elo Calculator?

I have a guy who is 3-0 he didn't get to #1.

He fought someone who is 2-0 and is now 3-1 and he has dropped down to 25 he is actually now behind someone who is 0-3. In addition it says his longest winning streak is 4, when in reality its 3 since he is 3-1.

That seems off.

I've checked elo formula and found only one error with longest winning streak always increasing by 1 in some circumstances.

bananalive

06-26-2009 10:20 AM

Quote:

Originally Posted by bananalive (Post 1837705)

I've checked elo formula and found only one error with longest winning streak always increasing by 1 in some circumstances.

I've played around with my test ladder with different scores and here are the results:

player 1 starts on 1083 and player 2 on 1000; p1 loses 2-3; new elo-ranks are 1057 and 1026

p1 starts on 1000 and p2 on 1057; p1 wins 4-2; new elo-ranks are 1026 and 1031

p1 starts on 1050 and p2 on 1000; game is draw; new elo-ranks are 1047 and 1003

p1 starts with 1047 and p2 with 1031; p1 wins 3-2; new elo-ranks are 1050 and 1025

These are all correct. (A higher k-value will mean one match will alter elo-rating more)

aztecboi2003

06-26-2009 10:53 AM

Do you know when you will have the updated version out yet? Thanks.

BlueNinjaGo

06-26-2009 01:52 PM

Quote:

Originally Posted by bananalive (Post 1837684)

I've just checked and it works fine on my forum.

Can you tell me what template hook you used?

Playa82

06-28-2009 04:10 PM

hey, i can't add tournaments or ladders after upgrade. can seomebody help me ?

bananalive

06-28-2009 05:17 PM

Quote:

Originally Posted by aztecboi2003 (Post 1837737)

Do you know when you will have the updated version out yet? Thanks.

No idea.

bananalive

06-28-2009 05:18 PM

Quote:

Originally Posted by BlueNinjaGo (Post 1837851)

Can you tell me what template hook you used?

$template_hook[postbit_userinfo_right_after_posts]

bananalive

06-28-2009 05:50 PM

Quote:

Originally Posted by Playa82 (Post 1838929)

hey, i can't add tournaments or ladders after upgrade. can somebody help me ?

Check your usergroup permissions.

Playa82

06-28-2009 06:10 PM

Quote:

Originally Posted by bananalive (Post 1839008)

Check your usergroup permissions.

i already did. i got all permissions as admin...

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