Clan Wars Rankings Ladder - 2 Year Weighted RPI

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Clan Wars Rankings Ladder - 2 Year Weighted RPI

Postby jpcloet on Sat Mar 20, 2010 2:25 pm

Combined with All clans:

  • Uses the RPI formulation of Win% (WP), Opponent's Win% (OWP) and Opponent's Opponent's Win% (OOWP) and then combined with a Strength of Schedule
  • A ladder contains all results for the last 2 years.
  • The A Ladder also includes Season 1 and Season 2 of the League (in total vs an opponent called Season 1), but is not included in the W-L-T record. The league is weighted less due to the amount of Doubles played in Season 1.
  • Most historical data is grandfathered. A ladder results need a minimum of 40 games
  • There is a Decay Factor which lessens the impact of older challenges. After 2 years, the factor is 0 and that challenge is removed from the database
  • The is also a Depth Factor. This factor places a higher weighting on larger challenges above the minimum game numbers.
  • I have added total Games to show the experience levels of clans
  • The A ladder has an additional factor call "Team Play". This factor is to promote a balance of Dubs-Trips-Quads. The target is an average of 2.85 to 3.15 players per game.
  • Ladder will be updated periodically and after significant challenges

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THOTA is not #1 due to Season 2 performance.
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Re: Clan Wars Rankings Ladder - 2 Year Weighted RPI

Postby pmchugh on Sat Mar 20, 2010 2:35 pm

One of the best ladders yet, despite being ruined by the A/B rank clan thing.
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Re: Clan Wars Rankings Ladder - 2 Year Weighted RPI

Postby danryan on Sat Mar 20, 2010 2:38 pm

That's a good looking ladder, what a lot of work has gone into this! Well done.
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Re: Clan Wars Rankings Ladder - 2 Year Weighted RPI

Postby Georgerx7di on Sat Mar 20, 2010 3:00 pm

I don't know how you did it JP, but that's a pretty damn good ladder. Although I think tofu is 3-0. Good ladder though. Nemesis and Kort are still undervalued, but after looking at the spread sheets myself, I amazed that you came up with something this good.
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Re: Clan Wars Rankings Ladder - 2 Year Weighted RPI

Postby Bones2484 on Sat Mar 20, 2010 3:07 pm

Georgerx7di wrote:Although I think tofu is 3-0.


Mythology is a B rated clan so it won't show.

Georgerx7di wrote:Kort are still undervalued,


I won't argue, but this is on KORT actually getting challenges (against A clans) under their belt. They'll move up in time... but for now their only result against an A is a tie against the #10 clan in only 30 games. They are ranked right around where they should be based on completed results only. Remember that the rankings don't judge "talent", only results.
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Re: Clan Wars Rankings Ladder - 2 Year Weighted RPI

Postby jpcloet on Sat Mar 20, 2010 3:10 pm

TOFU will be 3-0 if/when they beat AOD :oops: Those guys (and gals?) are goooood.

KORT will surely get a nice boost from Season 2 of the League, BPB might also get a bump.
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Re: Clan Wars Rankings Ladder - 2 Year Weighted RPI

Postby Georgerx7di on Sat Mar 20, 2010 3:42 pm

jpcloet wrote:TOFU will be 3-0 if/when they beat AOD :oops: Those guys (and gals?) are goooood.

KORT will surely get a nice boost from Season 2 of the League, BPB might also get a bump.


I believe Tofu has defeated G1, mythology, and dragoons. Does the record only reflect "A" level challenges?
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Re: Clan Wars Rankings Ladder - 2 Year Weighted RPI

Postby jpcloet on Sat Mar 20, 2010 3:43 pm

A ladder contains only the results of A vs A clans.
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Re: Clan Wars Rankings Ladder - 2 Year Weighted RPI

Postby Blitzaholic on Sat Mar 20, 2010 5:34 pm

now if Tofu played Tsm later in the year and we played IA, now, that would be some fireworks.
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Re: Clan Wars Rankings Ladder - 2 Year Weighted RPI

Postby pimphawks70 on Sat Mar 20, 2010 5:34 pm

jpcloet wrote:A ladder contains only the results of A vs A clans.


What happens if a B clan becomes and A clan? Will the challenge then affect the A ladder?
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Re: Clan Wars Rankings Ladder - 2 Year Weighted RPI

Postby jpcloet on Sat Mar 20, 2010 5:46 pm

pimphawks70 wrote:
jpcloet wrote:A ladder contains only the results of A vs A clans.


What happens if a B clan becomes and A clan? Will the challenge then affect the A ladder?


If a B rated Clan defeats or shows A level status in a challenge (>=40 games) against an A clan (aka qualifying challenge), that challenge and clan will be added to the A ladder results. All previous results of the promoted B clan do not transfer over.

There is some subjectivity here I realized, but it should work. I've also noted that if a clan falls below a 70 ranking, they are more likely a B clan. Hopefully B clans won't have to lobby on too many results. The next league will need to open up to opportunities and I have a plan.
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Re: Clan Wars Rankings Ladder - 2 Year Weighted RPI

Postby freakns on Sun Mar 21, 2010 4:38 am

surely one of the best, if not the best ladder jp has presented. great work mate, but you might consider removing A/B rated clans.

what interest me here is how is KoTR A rated clan? they have play only one challenge against A clans, and that challenge was 30 games tie? and as youve said "A ladder results need a minimum of 40 games", so if KoTR vs G1 was 30 games challenge, KoTR doesnt meets minimum requirements for being A rated clan.
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Re: Clan Wars Rankings Ladder - 2 Year Weighted RPI

Postby jpcloet on Sun Mar 21, 2010 6:38 am

freakns wrote:surely one of the best, if not the best ladder jp has presented. great work mate, but you might consider removing A/B rated clans.

what interest me here is how is KoTR A rated clan? they have play only one challenge against A clans, and that challenge was 30 games tie? and as youve said "A ladder results need a minimum of 40 games", so if KoTR vs G1 was 30 games challenge, KoTR doesnt meets minimum requirements for being A rated clan.


Most historical data is grandfathered

The standard back then was 30 games, and was 20 in the past at some point. Going forward, I'm expecting A clans to play a minimum of 40 games, and the average is close to that.
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Re: Clan Wars Rankings Ladder - 2 Year Weighted RPI

Postby andy_is_awesome on Sun Mar 21, 2010 10:07 am

jpcloet wrote:
pimphawks70 wrote:
jpcloet wrote:A ladder contains only the results of A vs A clans.


What happens if a B clan becomes and A clan? Will the challenge then affect the A ladder?


If a B rated Clan defeats or shows A level status in a challenge (>=40 games) against an A clan (aka qualifying challenge), that challenge and clan will be added to the A ladder results. All previous results of the promoted B clan do not transfer over.

There is some subjectivity here I realized, but it should work. I've also noted that if a clan falls below a 70 ranking, they are more likely a B clan. Hopefully B clans won't have to lobby on too many results. The next league will need to open up to opportunities and I have a plan.


If B Clan becomes A clan, none of the previous results transfer over?
So, AoC's challenge against EMPIRE would not transfer?

Also, I'd be interested in knowing what our A rank is (some number below 70), even though we are in B rank. If that's possible.
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Re: Clan Wars Rankings Ladder - 2 Year Weighted RPI

Postby jpcloet on Sun Mar 21, 2010 11:26 am

Not intialy although you could lobby to have it put in. With good reason it can be put it, but by default it is not.

If we added that challenge in and added Season 1 results for the other 2 clans here is the A ranking of a few B clans

Mythology 65.511
Agents of Chaos 65.398
The Last Warriors 58.502
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