CL Rating · Beta
How it is calculated
The CL Rating (Courtline Rating) is a 0-10 rating of one player's game, calculated from his box score. A normal game is about 6.3, a very good one is 8 or more (about 7 % of the games) and only about 1 in 200 reaches 9. It is in beta: we are still validating it with real games and it may change.
1. The four parts
Each part is counted in points of value, like PIR, and the parts are added up.
| Part | How it counts |
|---|---|
| Shooting | Efficiency: his points minus the league's points per shot attempt times his attempts, weighted 0.7 (a free-throw attempt counts as 0.44 of a shot). Plus volume: 0.35 per point scored, so a big scoring night at average efficiency still rates well. |
| Creation | Assists 1.1 each, turnovers −1.0 each. |
| Defence and work | Steals 1.0, blocks 0.7, offensive rebounds 1.0 and defensive rebounds 0.5, each. |
| Impact | Plus/minus × 0.05: a small weight, because it depends a lot on teammates. |
2. Compared with an average player
Each part is compared with half of what an average player of the league does in the same minutes. The sum of the four differences is his score for the game. Because the comparison is with the minutes he played, volume counts: a big game in many minutes is worth more than the same rate in a few.
3. From score to a 0-10 rating
The score is placed by percentile among all the historical player games we have (the reference games, from 2007-08 and 2015-16 onwards) and mapped to a normal curve with a mean of 6 and a spread (standard deviation) of 1.3. After the minutes step (below), the scale is stretched without changing the order, so that over all historical games the median is 6.3, a quarter of the games reach 7.0, one in ten 7.8, 3 % 8.5 and 0.5 % 9.0. Limited to 0-10.
4. Minutes
The fewer minutes he played, the closer the rating is moved to 6: rating = 6 + (rating − 6) × minutes / (minutes + 10). With 20 minutes he keeps two thirds of the distance to 6; with 5 minutes, only a third. Players with under 5 minutes get no rating.
5. The season rating
A player's season CL Rating is the simple mean of his game ratings, so anyone can check it by averaging them (the exact mean shows with two decimals on hover). In rankings only players with games in at least 50 % of the rounds played are listed, so a few good games do not top the table.
6. Beta
The weights come from checking the ratings against real games, and we are still doing that. If we change the method, every rating, past and present, is recalculated, and this page is updated.