One last question and request: MMR range

[Vurg-1970]

@Bob-111980

And again, I think my word usage of “notches” or ranges maybe distracting you, but thats what the post says, if -3 is bronze and 3 is GM, and its stored in std dev - there are ranges… 200 / 400 / 700… who knows… how can you argue aginst math!!! now this is just getting rediculous. And them saying it follows your closely - whats their definition of “closely”? To them closely COULD be 400 - WE DONT KNOW. Just cause YOU feel that maybe not close that is speculation on your part.

No, Jeff said MMR is stored very precisely to a very small decimal number. I think he said it explicitly in the interview he did with Seagull. We don’t have to speculate on that part. MMR is a floating point number that makes very small changes based on every match and the statistical data provided by that match. He explicitly said that it could change zero, or it could change a “large amount” based on the uncertainty information they also keep. So if you got into your first ever placements match, and played HORRIBLY relative to the other people at 0 MMR (the starting point, roughly equal to 2350 SR) then they will move your MMR in the negative direction more than they would for someone with a bunch of games already played that were recent.

The guide really is quite good.

Very good interview here: https://www.youtube.com/watch?v=bn8-aWPvLwE&t=520s

@Kaawumba-1133

Each player has a competitive MMR for each role (tank, dps, support, or open queue)5, 15. Role MMR is a hidden number6 that goes up when a player wins, and down when that player loses. How much it goes up and down is a complicated formula, based on many factors, but the essential truth of wins are good and losses are bad is certain7.

The end notes 3, 5, and 6 reference that video.

@Bob-111980

but I am freaking out that you guys not being able to read the very guide your referencing. And at one point it SAID 0.5 Std Dev… maybe not that guide but somewhere I read it on the forums.

Now I look at it, it JUST MIGHT BE 1 meaning 700 SR range per MMR value, but I’ll stick to my 0.5, I do believe I read it, I’ll look for some more.

The guide definitely says it’s a small decimal that moves every match.

@Kaawumba-1133

Typical SR movement has range of 20-30. Neutral SR movement (where the teams are balanced, there is no performance SR, etc.) is 24. Typical MMR movement is difficult to quantify as it is invisible, but is likely similar, but rescaled, so approximately 6*24/5000 = 0.029. If an account is inactive for a while, after the player returns SR/MMR gains will be exaggerated again for a time 11. For this reason, players that only do placements each season will tend to see high volatility in their rating each season.

The average MMR change per match is very likely close to 0.029 in the positive or negative.