Coming Soon… Elo Ratings (and eventually, others)

10 Jul , 2018,
jcs
5 comments

As you may know, the Elo system is a popular rating instrument used in the world of chess.  In the combat sports world, it has inspired the widely known boxing ratings over at BoxRec and to a lesser degree, the standard system used here.  From a broader standpoint, as far as I know, it is considered the grandfather of mathematical-based rating systems.

Now, it does have its flaws and those flaws were on display for many years over at site called MMA Elo, but those issues were compounded by the lackluster data efforts by that site’s creator — a problem you won’t see here.

At its core, Elo is simple math.  That’s what makes it so interesting.  It is very simple, but does offer a few variables that can be optimized for the specific task at hand, most notably, the K-factor.  Simply put, the K-factor affects the amount of change that a single contest can have — the lower the K-factor, the smaller the potential change and vice-versa.

In chess, a sport that often has a frequent, consistent and logical schedule, the K-factor is quite low, commonly between 16 and 32.  It turns out, a K-factor somewhere between 150 and 200 yields the most accurate prediction rates in MMA.

So, to start, the Elo system will be implemented with a starter rating of 1000 and a K-factor in the neighborhood of 170.  There will be no provisional system and no K-factor tiers (yet), but the plan is to offer a few flavors and perhaps incorporate some other common systems as well.  These flavors will be entirely driven by prediction rates in some shape or form and there will be no emphasis on subjectivity, so things could get a little wacky.

The “standard” system you’ve seen for over a decade will still be the default, but we’ll be giving you the option to filter the divisional pages by system.  The one thing to keep in mind, is that the Top X fighters displayed will (at least for now) be driven by the standard system only — which means that the #251 Heavyweight by our standard measure, may be the #249 Heavyweight by Elo, but since he didn’t make the standard cut, he won’t be in the lists.  This may or may not change in the future.

Any and all comments are welcome.


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    5 Comments

    1. jcs July 15, 2018 at 12:46 pm Reply

      I think the immediate plan will be…

      Current System — ‘Nuff said.

      Standard Elo – ‘Nuff said.

      Modified Elo – Standard Elo tweaked w/ some ideas I have. K-factor tiers, hometown advantage, graduated match result factor, etc. This will land somewhere between the standard Elo and the highly complex system in use now. **It will stay fairly simple and be driven by prediction rates and common sense**

      Will keep solid documentation and publish the facts on the Elo. The current system will remain in the pages and pages of disorganized code as well as my brain.

    2. Danny July 14, 2018 at 11:28 am Reply

      Just want to say you guys are dope and do wonderful work. You have made navigating the regional scene and understanding the tiers of the divisions so much easier for all these years. Thank you!

      • :D July 14, 2018 at 3:51 pm Reply

        What he said

    3. Scott July 13, 2018 at 4:42 pm Reply

      Awesome! I’m very excited to see the Elo system applied to MMA using the data here at Fight Matrix. My only question is when might I see this released?

      • oleg July 14, 2018 at 9:13 am Reply

        The initial version should be released within the next week.

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