This is probably not going to help explain it, because IDK what it means. LOL
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Win Share is a measure that is assigned to players based on their offense, defense, and playing time. WS/48 is win shares per 48 minutes and invented by Justin Kubatko who explains: “A win share is worth one-third of a team win. If a team wins 60 games, there are 180 ‘Win Shares’ to distribute among the players.”
Also:
III. Crediting Offensive Win Shares to Players
A. 1977-78 to present NBA
Offensive Win Shares are credited to players based on Dean Oliver's points produced and offensive possessions. The formulas are quite detailed, so I would point you to Oliver's book
Basketball on Paper for complete details. The process for crediting Offensive Win Shares is outlined below (using
LeBron James of the
2008-09 Cleveland Cavaliers as an example):
- Calculate points produced for each player. In 2008-09, James had an estimated 2345.9 points produced.
- Calculate offensive possessions for each player. James had an estimated 1928.1 offensive possessions in 2008-09.
- Calculate marginal offense for each player. Marginal offense is equal to (points produced) - 0.92 * (league points per possession) * (offensive possessions). For James this is 2345.9 - 0.92 * 1.083 * 1928.1 = 424.8. Note that this formula may produce a negative result for some players.
- Calculate marginal points per win. Marginal points per win reduces to 0.32 * (league points per game) * ((team pace) / (league pace)). For the 2008-09 Cavaliers this is 0.32 * 100.0 * (88.7 / 91.7) = 30.95.
- Credit Offensive Win Shares to the players. Offensive Win Shares are credited using the following formula: (marginal offense) / (marginal points per win). James gets credit for 424.8 / 30.95 = 13.73 Offensive Win Shares.
B. 1973-74 to 1976-77 NBA
The NBA did not track player turnovers until the 1977-78 season, and player turnovers are needed to calculate player possessions. However, the NBA did track turnovers at the team level from 1973-74 to 1976-77. Since player turnovers are the only thing holding us back from using the method outlined above, I have chosen to estimate player turnovers for this time period. Player turnovers are estimated as follows (using
Kareem Abdul-Jabbar of the
1976-77 Los Angeles Lakers as an example):
- Obtain an initial estimate of the player's turnovers. To do this use the following formula: -0.0005075172 * (minutes played) * (player age)
- 0.0873982755 * (field goals)
+ 0.0925506598 * (field goal attempts)
+ 0.1566322510 * (free throw attempts)
+ 0.0449241773 * (total rebounds)
+ 0.2321637159 * (assists)
+ 0.2040169400 * (personal fouls)
Note that if this number is less than zero, then it should be rounded up to zero. Plugging Abdul-Jabbar's statistics into the formula above we get an estimate of 280.316 turnovers.
- Find the sum of estimated turnovers for the players on the given team. The sum for the players on the 1976-77 Lakers is 1448.057.
- Calculate the player's share of this total. Abdul-Jabbar's share of the team total is 280.316 / 1448.057 = 0.194.
- Multiply the team's turnovers (adjusted for team turnovers) by the player's share. As mentioned, the NBA tracked turnovers at the team level in these seasons. However, the team totals include team turnovers (i.e., turnovers that are not attributed to an individual player). Thus, we multiply the team's turnovers by 0.985, then multiply this adjusted figure by the player's share. For Abdul-Jabbar this is 1538 * 0.985 * 0.194 = 293.9, which we round up to 294.
Now that we have this estimate, the method above is used to complete the calculation of Offensive Win Shares.
Furthermore:
IV. Crediting Defensive Win Shares to Players
A. 1973-74 to present NBA
Crediting Defensive Win Shares to players is based on Dean Oliver's Defensive Rating. Defensive Rating is an estimate of the player's points allowed per 100 defensive possessions (please see Oliver's book for further details). Here is a description of the process (once again using
LeBron James in 2008-09 as an example):
- Calculate the Defensive Rating for each player. James's Defensive Rating in 2008-09 was 99.1.
- Calculate marginal defense for each player. Marginal defense is equal to (player minutes played / team minutes played) * (team defensive possessions) * (1.08 * (league points per possession) - ((Defensive Rating) / 100)). For James this is (3054 / 19780) * 7341 * ((1.08 * 1.083) - (99.1 / 100)) = 202.5. Note that this formula may produce a negative result for some players.
- Calculate marginal points per win. Marginal points per win reduces to 0.32 * (league points per game) * ((team pace) / (league pace)). For the 2008-09 Cavaliers this is 0.32 * 100.0 * (88.7 / 91.7) = 30.95.
- Credit Defensive Win Shares to the players. Defensive Win Shares are credited using the following formula: (marginal defense) / (marginal points per win). James gets credit for 202.5 / 30.95 = 6.54 Defensive Win Shares.
Does this in any way help explain it? :Shrug: I just ignore it, LOL!