ELO Rating System for TWD

[Kim]

I worked on this for a bit with Myth and this is what we have:

This is mainly Myth's work (obviously) Thanks Myth

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Squads start off with 1000 rating points.
When a TWD game has been played, the new rating of the squad will be determined by the following formula:

New Rating = Old Rating + K(W-P)

P = Probablitity of winning
K = Maximum rating change
W = 1 if the squad has won, W = 0 if the squad has lost


P = 1 / (1 + 10^(-difference_in_ratings / 400))
K = 50





Example:
wolvencreed (rating 1000) vs Pallies (rating 1400)



first we'll calculate the probability of winning of wolvencreed over Pallies:
difference_in_ratings = 1000-1400 = -400

P = 1 / (1+10^(-(-400) / 400))
P = 1 / (1+10^1)
P = 1 / 11
P = 0.09 = 9% chance of wolvencreed winning over Pallies.
then ofcourse, the chance of Pallies winning over wolvencreed is 1-0.09 = 0.91 = 91%

- Scenario: wolvencreed wins!
so, for wolvencreed: W = 1
new rating = old rating + K * (W-P)
new rating = 1000 + 50 * (1-0.09)
new rating = 1000 + 45.5 = 1046

for Pallies: W = 0
new rating = 1400 + 50 * (0-0.91) = 1400 + (-45.5) = 1354.5 = 1355



-

K (maximum rating change) is set to 50 in this example. We're considering to lower K when a squad plays more games.

This is info concerning calculating the rating points for TWD. The quote was taken from an ancient post by Overstrand, and Guano thought it would be a good idea to sticky this, because enough people question about it every so often. So instead of staffers giving you a half-assed answer about it all, you can check it out here, if you didn't already know how the rating system works.

This is also a great way to maximize the points your squad can earn, whilst comparing the amount of points that can be lost to any given squad.

[DOTSY]

you used the word ass ! omg omg

great idea btw, very nice !

good work again

[Kings]

Tu me pisse à la raie!

[Kim]

Wax that post by Overstrand was made in 2002. The system has not changed since.

[Vykromond]

...electric light orchestra?

[Due]

lol wax, way to go bro

[colony]

cool system. Thanks for posting the 'source'.

[Anduril.]

Too difficult .. can't understand it
If it's about food, pm me in the game.

[ogron]

great dig, Kim!

[Rigor]

BAM

[HildoZ]

TWD Calculator - Website

hey hey ....

Last season I wrote a php-script to calculate the matches
(for those who can't calculated that by hand :P or head :wacko: )

With the start of the new TWD-WebSite and TWSD I fixed some stuff
and added a SD-Calculator.

For now it's just a nice tool to play with for you,
but if ya battle for points close to the start of next TWL it might become useful ... :whistling:

here's the Link, notify me if it doesnt work ....TWD - Calculators

I fixed the missing Squads, if ya still find bugs mail me ....

HildoZ

[Barton]

Greetings Hildoz

i cant find my squadron on the dd list

3 Value 1419

it would be nice if u fix that bug!

thank you.

[Asmodeus]

some squads are missing

[Edify]

that's a neat calculator. when i saw this thread in new posts i was going to ask if there was a calculator. gj!