sjm34 wrote:I guess I am not understanding your logic. If a team shoots and misses it doesn't matter who got the rebound for that possession. The possession doesn't continue on if the team got an offensive rebound. They reset the clock and start their next possession. So if Trey Burke takes a shot and Favors gets the rebound over Young and puts it back in on a layup the eFG% is 50, not 100.
You can find the definition of possession that is used in advanced metrics for example from
http://en.wikipedia.org/wiki/APBRmetricsWikipedia. It is calculated with following formula:
Possessions = .96 * (FGA - ORb + TO + (0.44*FTA))
The logic about the way possessions are calculated there is that offensive rebound doesn't cause new possession, it basically just extends original possession. This means that team defensive rebounding is part of defensive rating and team offensive rebounding is part of offensive rating. That makes perfectly sense because I think defensive rebounding is part of defense and offensive rebounding is part of offense.
In your example, it is true that eFG% is just 50% if points are scored from offensive rebound but for offensive rating (and defensive rating) it doesn't change anything whether points are scored with one shot attempt or by taking several offensive boards before finally scoring.
Also if you look team offensive rating stats from
http://stats.nba.com/league/team/#!/advanced/?sort=OFF_RATING&dir=1NBA.com, you see that Phoenix for example has currently higher offensive rating than Atlanta (106.4 vs 106.2) despite having worse TS% (55.8 vs 56.5) and higher turnover rate (15.3 vs 14.9). This is possible because they are much better offensive rebounding team. (offensive rebounding rate 24.4 vs 21.0)