Disc Golf Course Review [Request] Let's Settle The Ratings Mystery
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#51
10-11-2020, 10:26 AM
 DiscFifty * Ace Member * Join Date: Sep 2012 Years Playing: 9.6 Courses Played: 19 Throwing Style: RHBH Posts: 4,273 Niced 1,584 Times in 885 Posts

Quote:
 Originally Posted by Discette The round was more than 2.5 standard deviations below his current rating.
Thank you! Now...any idea what a standard deviation is?
#52
10-11-2020, 12:22 PM
 brutalbrutus * Ace Member * Join Date: Jul 2013 Location: the nati Years Playing: 10.3 Courses Played: 53 Throwing Style: RHBH Posts: 11,612 Niced 5,727 Times in 2,961 Posts

Quote:
 Originally Posted by DiscFifty Thank you! Now...any idea what a standard deviation is?

#53
10-11-2020, 01:53 PM
 Jugular Birdie Member Join Date: Sep 2019 Location: Surrey, England Posts: 329 Niced 190 Times in 111 Posts

Quote:
 Originally Posted by DiscFifty Thank you! Now...any idea what a standard deviation is?
It's the square root of the average of the distance of each point in the distribution from the mean.

Most people assume a Normal distribution (or bell curve) when talking about standard deviations and I would assume that's the case here, but it could easily be something else.

2.5 standard deviations below the mean in a Normal distribution should mean all but the 0.31% worst rounds should be included in their rating. i.e. if they played 10,000 rounds the 31 worst rounds would be discarded.

Exactly how they're calculating the standard deviations for each player I'm not sure, I would suspect that by now if there were a fixed ratio or rating point difference it would have been deduced by now. In which case it may be based on fitting a distribution to their range of rounds. i.e. if a player is less consistent then a round would have to be worse to be discarded than a round from a more consistent player.

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