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What determines Elo and Percentile?

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7/8/2015 4:14:04 PM
Posted: 2 years ago
"Here's the equation:

W = winner's original ELO
L = loser's original ELO
D = change in ELO

D = 100*(W+9L)/10W

And there is a 25 point instigator advantage (meaning the instigator gets +25 and the contender gets -25)."

Percentile is just who has a lower elo than you I believe
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7/8/2015 4:21:39 PM
Posted: 2 years ago
Half credit to Lexus. She got Elo right but didn't quite get percentile right.

Percentile ranking is based off your number of wins compared to the rest of the userbase. It's highly in accurate and useless in ranking people because I'm not kidding when I say the entire userbase. When you rack up your first two wins, you're placed above all the members who signed up and did one debate, win or loss, and never used th site again. Which means you're better than roughly 3/4ths of the userbase. It also doesn't factor in for other things, namely losses as well as wins, which is why it fails overall.
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7/8/2015 4:22:46 PM
Posted: 2 years ago
While the ELO equation is correct, percentile is actually based on the number of wins. In other words, if you are in the Xth percentile, then x percent of DDO has a lower win ratio than you (it's not a completely accurate number because it's based on very old statistics, but that's the basic idea behind it).
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