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How do ratings compare between servers?
Below, 3 tables compare ratings on three popular servers: FIBS,
GamesGrid and Netgammon. The tables were compiled from server-provided
ratings lists and include all players and only those players who meet
a server's requirements for inclusion on its list:
FIBS, all users with 50 or more experience points;
GamesGrid, all rated accounts;
Netgammon, members with 10 or more experience points.
The FIBS list, therefore, includes 6148 players but excludes 7736
registered users who have less than 50 experience points. The
Netgammon list includes 4575 players but excludes perhaps 1500 members
with less than 10 experience points and an unknown number of
nonmembers (Netgammon claims 16,000 players in all). The rather
impossible task of identifying and excluding all nonplaying,
duplicate, staff, monitor, and/or spurious accounts has not been
attempted with the exception of 3 obviously nonplaying accounts at the
very bottom of the GamesGrid rating list.
Data is current as of 9/19/99 (FIBS) and 9/22/99 (GamesGrid and
Netgammon).
TABLE 1 -- % of Players By Rating
This table presents the number and percentage of players at or
particular ratings:
----FIBS---- --GamesGrid- --Netgammon- Rating
# % # % # %
1 00.02% 0 00.00% 2 00.04% 2200.00
1 00.02% 0 00.00% 23 00.50% 2100.00
9 00.15% 10 00.45% 81 01.77% 2000.00
24 00.39% 32 01.42% 158 03.45% 1950.00
75 01.22% 88 03.92% 259 05.66% 1900.00
173 02.81% 169 07.53% 404 08.83% 1850.00
368 05.99% 296 13.20% 615 13.44% 1800.00
604 09.82% 415 18.50% 892 19.50% 1750.00
973 15.82% 596 26.57% 1264 27.63% 1700.00
1424 23.16% 772 34.41% 1689 36.92% 1650.00
2035 33.10% 1011 45.07% 2212 48.35% 1600.00
2708 44.05% 1245 55.50% 2751 60.13% 1550.00
3570 58.07% 1550 69.10% 3311 72.37% 1500.00
4323 70.32% 1817 81.00% 3756 82.10% 1450.00
4991 81.18% 2001 89.21% 4081 89.20% 1400.00
5744 93.43% 2178 97.10% 4397 96.11% 1300.00
6021 97.93% 2227 99.28% 4510 98.58% 1200.00
6148 100.00% 2243 100.00% 4575 100.00% 0.00
TABLE 2 -- Ratings and Rankings by percentile
Table 2 is perhaps more useful than Table 1 for comparing the ratings
curve on different servers.
Percentile -----FIBS----- --GamesGrid-- ---Netgammon---
Rating Rank Rating Rank Rating Rank
Top 100% 2239.76 1 2080.47 1 2276.53 1
99% 1907.52 61 1964.74 22 2040.57 46 <<Top 1%
95% 1813.72 307 1881.13 112 1915.58 229 <<Top 5%
90% 1748.10 615 1828.51 224 1833.06 458 <<Top 10%
85% 1706.85 922 1783.65 337 1786.61 686 <<Top 15%
80% 1669.00 1230 1737.85 449 1740.29 951 <<Top 20%
70% 1614.43 1844 1674.34 673 1685.29 1373 <<Top 30%
60% 1566.99 2459 1626.10 897 1634.59 1830 <<Top 40%
Median 50% 1526.96 3074 1577.14 1122 1593.47 2288 <<Top half
40% 1491.91 3689 1533.07 1346 1550.34 2745
30% 1451.34 4304 1496.25 1570 1509.91 3206
20% 1405.72 4918 1455.37 1794 1460.97 3669
10% 1337.23 5533 1391.68 2018 1392.58 4118
Bottom 0% 533.26 6148 961.56 2243 766.68 4575
TABLE 3 -- Ratings creep
Table 3 presents the percentage of currently rated players on FIBS,
GamesGrid and Netgammon rated above 1500.00, the starting rating and
nominal starting point for new players:
FIBS GamesGrid Netgammon
% # % # % #
58.06% 3570 69.10% 1550 72.37% 3311
Over time, ratings systems suffer from "ratings creep" as lower ranked
players drop out of the system with greater frequency than higher
rated players. This is normal and unavoidable. Median rating and the
ratings curve in general will also rise if rated players earn points
from players who are excluded from the ratings list because of minimum
experience or membership requirements and, assumedly, have generally
lower ratings than the players who are on the ratings list.
Other reasons for ratings creep include ratings manipulation by
players (unauthorized ratings "boosting" or authorized resetting
(starting over at 1500.00) and by servers (assigning new players
ratings not earned through play on the server, such as starting a new
player with a rating earned on another server, or some other awarding
of points not earned through play against other players on the
server).
________________________________________________
Daniel Murphy www.cityraccoon.com/
Humlebæk Backgammon Klub www.hbgk.dk/
Raccoon on FIBS www.fibs.com/
Raccoon on GamesGrid too
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