DSJ4  Online Rating
The online rating is a statistical estimation of each player's
current skill level. The calculation of online ratings is
adapted from the Elo rating system, which is commonly used to
rate the chess players.
All players get initially online rating of 1000 points. The
ratings are updated after each competition according to the
players' placing in the competition. Each player gains rating
points from those players who had worse placing in the
competition and lose rating points to those players who had
better placing in the competition. If a player left the
competition after the competition had begun but before it was
finished, he or she will lose rating points to all other
players who were still competing.
The amount of rating points gained or lost depends on the
original difference in the players' ratings. If a player with
much higher rating wins another player with a lower rating, only
a small amount of rating points will be shifted from the
losing player to the winning player. Instead, if a player with
the much lower rating wins, he or she will get much more rating
points from the player with the higher rating.
The following formula is used to calculate the change of rating
(R) for each pair of ski jumpers after the competition is
finished:
In addition to the current online ratings also the peak online
ratings are tracked. The peak online rating tells how high
the player's online rating has been at its highest level.
If you are interested about the fundamentals of this rating
system please check the Wikipedia article
about
The Elo rating system.
