Corny.
Stop playing dumb, you know very well I'm talking about the
individual DRTG. The irony of you claiming that I'm ducking when you go and purposefully post something else, something that we weren't even arguing about.
Defensive Rating
Just as Oliver's Offensive Rating represents points produced by the player per 100 possessions consumed, his Defensive Rating estimates how many points the player allowed per 100 possessions he individually faced while on the court.
The core of the Defensive Rating calculation is the concept of the individual Defensive Stop. Stops take into account the instances of a player ending an opposing possession that are tracked in the boxscore (blocks, steals, and defensive rebounds), in addition to an estimate for the number of forced turnovers and forced misses by the player which aren't captured by steals and blocks.
The formula for Stops is:
where:
- Stops1 = STL + BLK * FMwt * (1 - 1.07 * DOR%) + DRB * (1 - FMwt)
- FMwt = (DFG% * (1 - DOR%)) / (DFG% * (1 - DOR%) + (1 - DFG%) * DOR%)
- DOR% = Opponent_ORB / (Opponent_ORB + Team_DRB)
- DFG% = Opponent_FGM / Opponent_FGA
- Stops2 = (((Opponent_FGA - Opponent_FGM - Team_BLK) / Team_MP) * FMwt * (1 - 1.07 * DOR%) + ((Opponent_TOV - Team_STL) / Team_MP)) * MP + (PF / Team_PF) * 0.4 * Opponent_FTA * (1 - (Opponent_FTM / Opponent_FTA))^2
Also necessary is the calculation of Stop%, which is the rate at which a player forces a defensive stop as a percentage of individual possessions faced (essentially the inverse of Floor%, but for defenders):
- Stop% = (Stops * Opponent_MP) / (Team_Possessions * MP)
With those numbers in hand, individual Defensive Rating can be computed:
- DRtg = Team_Defensive_Rating + 0.2 * (100 * D_Pts_per_ScPoss * (1 - Stop%) - Team_Defensive_Rating)
where:
- Team_Defensive_Rating = 100 * (Opponent_PTS / Team_Possessions)
- D_Pts_per_ScPoss = Opponent_PTS / (Opponent_FGM + (1 - (1 - (Opponent_FTM / Opponent_FTA))^2) * Opponent_FTA*0.4)
Notes:
- In a later chapter of Basketball on Paper, Oliver emphasized that Offensive Ratings shouldn't be viewed in a vacuum. Introducing a concept he called "Skill Curves", he acknowledged that a player's ORtg needed to be judged in conjunction with his Usage Rate, a measure of how big a role the player fills in his team's offense. The bigger the role, the more difficult it is to maintain a high ORtg; the smaller the role, the easier it is to be highly efficient. Because of this, Oliver stressed that a player's ORtg should primarily be compared to those of other players in a similar role.
- Out of necessity (owing to a lack of defensive data in the basic boxscore), individual Defensive Ratings are heavily influenced by the team's defensive efficiency. They assume that all teammates are equally good (per minute) at forcing non-steal turnovers and non-block misses, as well as assuming that all teammates face the same number of total possessions per minute.
- Perhaps as a byproduct, big men tend to have the best Defensive Ratings (although Oliver notes that history's best defensive teams were generally anchored by dominant defensive big men, suggesting that those types of players are the most important to a team's defensive success). A corollary to this is that excellent perimeter defenders who don't steal the ball a lot — for instance, Joe Dumars or Doug Christie — are underrated defensively by DRtg, and are prone to look only as good as their team's overall defense performs.
Can your dumbass not see that a stop in this formula is through an individual's box score? Defensive rebounds, steals and blocks. It doens't take into acount "
how much points are scored against you while you play...." like you think it does.
Individual ORTG = is basically how many points you score
Individual DRTG = is basically how many steals, blocks and defensive rebounds you get + your team's contributions through the box score on defense
You can't use Bball Ref's individual DRTG in the manner that you did, because the formula is heavily weighted by the contributions of the team (not just the individual), and it only takes into account the individual's blocks, steals and rebounds - not many points that individual stops the opposition team from scoring and/or how many points are scored against that individual.
This is all just simple shyt. And it shouldn't need this breakdown if you actually read it properly.