Clan Rankings - RPI Version [Archived]

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Clan Rankings - RPI Version [Archived]

Postby jpcloet on Thu Jul 02, 2009 9:58 am

The following ranking systems uses a variation of the College RPI System.

This ladder system was created after test running an ELO ladder which had a hard time dealing with a lack of data, and mid-level clans winning significantly over newer clans which led to some skewed results.

How this Version Works:
  • Once a clan challenge is completed, it is added to the database (Excel File)
  • Using some complex calculations and look-ups, it calculates out Win Percentage (WP), Opponent's Win Percentage (OWP) and Opponent's Opponent's Win Percentage (OOWP), and the Reliability Factor (RF). (See below for Factor rates)
  • An RPI is generated for each team, generally between 1.00 and 2.00 using RPI = [(WP + OWP + OOWP) * RF]
  • Based on all the RPI's, they are all scaled up to a Grading out of 100 with the top Clan at a 100 Rating

Reliability Factors:
  • 0.00 if your clan is extinct
  • 0.80 for 1 completed challenge
  • 0.85 for 2 challenges
  • 0.90 for 3 completed challenges and less than 61 total games
  • 1.00 for 3 completed challenges and more than 60 total games

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Re: Clan Rankings - RPI Version [Updated July 2-2009]

Postby Scott-Land on Sat Jul 04, 2009 11:46 am

Would it be too difficult to post along with the RPI's win percentages and overall records-- JP?
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Re: Clan Rankings - RPI Version [Updated July 2-2009]

Postby jpcloet on Sat Jul 04, 2009 12:11 pm

Scott-Land wrote:Would it be too difficult to post along with the RPI's win percentages and overall records-- JP?


I can do the win % easilly, overall record will be a bit of work.

Had several suggestions on new colours via pm as well.
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Re: Clan Rankings - RPI Version [Updated July 2-2009]

Postby Blitzaholic on Sun Jul 05, 2009 9:36 am

nice work jp
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Clan League to ladder....

Postby jackin_u_up on Wed Jul 08, 2009 1:54 pm

Just Curious and maybe i missed it.... but are the results of our divisional 20 game sets going to actually go down on Record as clan war results ?

I understand they are being factored into the clan ladder RPI ratings but i looked in a couple threads and couldn't find this being discussed.

IMO i think they should go down on record as a clan war. anyone else :idea:
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Re: 2009 Clan League - Table June 28th-09 (THOTA Leads)

Postby reptile on Wed Jul 08, 2009 2:28 pm

jackin_u_up wrote:Just Curious and maybe i missed it.... but are the results of our divisional 20 game sets going to actually go down on Record as clan war results ?

I understand they are being factored into the clan ladder RPI ratings but i looked in a couple threads and couldn't find this being discussed.

IMO i think they should go down on record as a clan war. anyone else :idea:


it was my understanding they were going to. but yes i agree with you.
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Re: 2009 Clan League - Table June 28th-09 (THOTA Leads)

Postby jpcloet on Wed Jul 08, 2009 2:38 pm

Check the new ladder, all 20 game set will be added. They are actually all set up in the file and actually linked to the main league file, so there are some partial results in there right now.
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Re: 2009 Clan League - Table June 28th-09 (THOTA Leads)

Postby jackin_u_up on Wed Jul 08, 2009 2:50 pm

jpcloet wrote:Check the new ladder, all 20 game set will be added. They are actually all set up in the file and actually linked to the main league file, so there are some partial results in there right now.


What do u mean by partial results jp ?
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Re: 2009 Clan League - Table June 28th-09 (THOTA Leads)

Postby jpcloet on Wed Jul 08, 2009 2:51 pm

That means if I've updated the league file and only 7 games of a second series is complete, then the results of say 9-8 (3 games not comlete) are in the database.
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Re: 2009 Clan League - Table June 28th-09 (THOTA Leads)

Postby Blitzaholic on Wed Jul 08, 2009 3:10 pm

jackin_u_up wrote:Just Curious and maybe i missed it.... but are the results of our divisional 20 game sets going to actually go down on Record as clan war results ?

I understand they are being factored into the clan ladder RPI ratings but i looked in a couple threads and couldn't find this being discussed.

IMO i think they should go down on record as a clan war. anyone else :idea:




jp said he was going to count it if they are 20 games completed vs the same clan


however, I disagree and do not think this should be counted as 20 games, as 20 games is too small of a sample and I suggest none should be counted unless it is at least 40 games or more against one clan, perhaps we should put this to a vote. With 40 games or more, more games the better tends to help measure skill a little more and evens out the luck drops and dice factors, after all, we all would like this clan ladder rating system to reflect skill more than luck, I personally would like it 60 to 100 games, but, to be fair, a minimum of 40 is a good measurement.



respectfully, blitz
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Re: 2009 Clan League - Table June 28th-09 (THOTA Leads)

Postby hwhrhett on Wed Jul 08, 2009 3:17 pm

Blitzaholic wrote:
jackin_u_up wrote:Just Curious and maybe i missed it.... but are the results of our divisional 20 game sets going to actually go down on Record as clan war results ?

I understand they are being factored into the clan ladder RPI ratings but i looked in a couple threads and couldn't find this being discussed.

IMO i think they should go down on record as a clan war. anyone else :idea:




jp said he was going to count it if they are 20 games completed vs the same clan


however, I disagree and do not think this should be counted as 20 games, as 20 games is too small of a sample and I suggest none should be counted unless it is at least 40 games or more against one clan, perhaps we should put this to a vote. With 40 games or more, more games the better tends to help measure skill a little more and evens out the luck drops and dice factors, after all, we all would like this clan ladder rating system to reflect skill more than luck, I personally would like it 60 to 100 games, but, to be fair, a minimum of 40 is a good measurement.



respectfully, blitz


you really should have been a part of the discussion about this 6 months ago....

but for the record, i still think it is good that they will count towards clan ladder.
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Re: 2009 Clan League - Table June 28th-09 (THOTA Leads)

Postby Blitzaholic on Wed Jul 08, 2009 3:24 pm

hwhrhett, I did not have access to that hidden forum where you all discussed it, I believe only david wain and andrewb did from our clan.
Last edited by Blitzaholic on Wed Jul 08, 2009 3:25 pm, edited 1 time in total.
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Re: 2009 Clan League - Table June 28th-09 (THOTA Leads)

Postby jpcloet on Wed Jul 08, 2009 3:25 pm

20 used to be the most common size although challenges are growing, more often that not the 20 game sets are for new clans and clans attempting to enter the CLA. The average size is about 38 now. You will notice that the RPI factor is unfavorable for clans who don't play many challenges or play many games. A clan with 3 challenge results, but only 60 games (3 * 20) is still not given a factor of 1.00.

Ignoring the league, here are the stats (round to the nearest 10)

Size----Count
100---- 1
60---- 5
50---- 3
40---- 23
30---- 7
20---- 13

The handbook does talk about both sizes. However, maybe we should include 40 games as being "The recommended size for determining skill"

This is actually off-topic now, I will be moving this to the ladder discussion.
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Re: Clan Rankings - RPI Version [Updated July 2-2009]

Postby jpcloet on Wed Jul 08, 2009 3:28 pm

Moved to ladder discussion.
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Re: 2009 Clan League - Table June 28th-09 (THOTA Leads)

Postby Blitzaholic on Wed Jul 08, 2009 3:28 pm

jpcloet wrote:20 used to be the most common size although challenges are growing, more often that not the 20 game sets are for new clans and clans attempting to enter the CLA. The average size is about 38 now. You will notice that the RPI factor is unfavorable for clans who don't play many challenges or play many games. A clan with 3 challenge results, but only 60 games (3 * 20) is still not given a factor of 1.00.

Ignoring the league, here are the stats (round to the nearest 10)

Size----Count
100---- 1
60---- 5
50---- 3
40---- 23
30---- 7
20---- 13

The handbook does talk about both sizes. However, maybe we should include 40 games as being "The recommended size for determining skill"

This is actually off-topic now, I will be moving this to the ladder discussion.



yes, agreed JP, thank you considering this: maybe we should include 40 games as being "The recommended size for determining skill" because all must admit 40 games is much better than 20 and as you said JP "A clan with 3 challenge results, but only 60 games (3 * 20) is still not given a factor of 1.00." and the clan ladder of counting 20 games hinders clans who only played a few challenges, the clan league should be different and seperate than clan challenges unless all play against same clan at least 40 games. again, ty jp for be open about this.
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