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Question regarding calculating of career advanced %'s.
Posted: Sat Jul 25, 2015 5:42 am
by BasketDork
With regards to the advanced statistics found at basketball-reference.com, such as AST%, ORB%, DRB%, TRB%, STL%, BLK%, USG%, they have a description of how each is calculated, but how are the career values arrived at? Is it minute-weighted? Or is it calculated using their career numbers and the grand totals of all teams the player was on over the course of their career ? If this question is dumb, my apologies, I was just curious about the methodology.
Re: Question regarding calculating of career advanced %'s.
Posted: Sat Jul 25, 2015 4:20 pm
by Crow
Maybe somebody here has a good guess, but might be more certain of getting right answer by contacting BR directly using their contact form. A couple of former BR staff could answer here, but that seems fairly unlikely given activity levels.
Re: Question regarding calculating of career advanced %'s.
Posted: Sat Jul 25, 2015 9:34 pm
by Mike G
The team and opponent rates are already incorporated into each season (or part season with a team) rates. So I'm quite sure they just weigh by minutes each (part-) season.
To check, find a 2-year player with major differences from yr1 to yr2. See if your totals match theirs.
Re: Question regarding calculating of career advanced %'s.
Posted: Sun Jul 26, 2015 1:07 am
by BasketDork
Mike G., you're right..I took a look at Victor Oladipo, for example, his minutes, and two of the bigger gapped advanced stats for him, PER and TOV% :
Code: Select all
Min PER TOV%
13-14 2487 13.6 19.2
14-15 2573 15.9 14.3
Total 5060 14.8 16.7
PER= ((2487/5060)×13.6) + ((2573/5060) × 15.9) = 14.769 =14.8
TOV%= ((2487/5060) × 19.2) + (2573/5060) × 14.3) = 16.708 = 16.7
So, yes, it is in fact minute-weighted, it appears.
Re: Question regarding calculating of career advanced %'s.
Posted: Mon Jul 27, 2015 7:46 pm
by Mike G
I had thought there wouldn't be any other way to do it; but what if you don't weigh by minutes but by possessions?
Assuming a given player doesn't change his team's pace -- being on the floor vs off the floor -- he might have more rebound opportunities per minute, etc, in one season vs another.
In the Oladipo case, Orlando's pace in his 2 seasons has been almost identical.
Since we're on Orlando, I see that Dwight Howard in his rookie season (2005) played for Johnny Davis, at the league's 3rd-fastest pace, 94.7
In his 2nd season, under Brian Hill, they were 7th slowest, at 88.3
That's 7% more possessions per game and per minute in year 1. Could this give different results?
A few Dwight stats that changed significantly:
Code: Select all
.yr Pace Min Poss PER DRb% Ast% Usg%
2005 94.7 2670 5268 17.2 22.2 4.4 16.7
2006 88.3 3021 5557 19.3 29.2 7.2 21.3
total by min. 5691 18.31 25.92 5.89 19.14
total by possessions 10825 18.28 25.79 5.84 19.06
total by b-r.com 18.3 25.9 5.9 19.2
It does appear as if minutes rule over possessions. But some might disagree with this approach.
Re: Question regarding calculating of career advanced %'s.
Posted: Fri Jul 31, 2015 7:44 pm
by BasketDork
Could take pace adjustment and adjust yearly totals or take the yearly pace adjustments and weigh them by minutes as well.