LesGrossman wrote:A question for the advanced stats experts. We all know that assists are kind of random as a basic number. Also, some home scoring tables are quite liberal with what they consider an assist. I have personally seen (while watching the game and score keepers live) a pass on the 3pt line to a guy who then takes three (!) dribbles into the paint, including several spin and cross over moves, being counted as an assist. Naturally, this has caused an inflation in assist numbers which are then unfairly being compared to earlier eras of NBA basketball where the rules seemed to be much more strict (when i started watching, there was a maximum of one dribble after receiving the assist in place, otherwise it was an unsassisted basket). I believe the idea behind the number. the real art of the assist is is to account for the fact that one guy puts another guy into a position to score easily that he wouldnt have had otherwise; tough to write down but i have a feeling of what a "real" assist is vs. what a "stat" assist is.
My question: Is there a reliable independant statistic for "real" assists, and what are the criteria?
I'm not aware of anything that represents a clearly superior approach to assist-tracking than the NBA for all NBA games, but I will say that when Ben Taylor was first getting started as an independent analyst, he did a lot of hand tracking and one of the stats he tracked was something he called Opportunities Created (OC).
The idea there is that a) his standard for actual assists was higher than the NBA, but b) he didn't focus on whether the shot actually went in. He was looking at what the playmaker was doing and judging whether the player was truly creating opportunities for others.
From there he ended up using regression to create a stat that let him estimate historically how many opportunities players were creating (Box Creation) BC.
I'm not going to post a bunch of details here but I will say when I look now at leaders in BC by season, here's what I see:
1. Westbrook '16-17
2. Harden '17-18
3. Nash '06-07
4. Nash '09-10
5. Nash '07-08
Others high on the list: Mark Price, John Stockton, Magic Johnson, Steph Curry, Chris Paul, LeBron James
I'd note that I wouldn't exactly call Ben super-high on Westbrook or Harden in general. This isn't a statement of who was a better passer or playmaker but a statement about how much opportunity creation is falling on one man, and so it shouldn't be a surprise that helios and classic floor generals rank high.
All of this stuff is beyond the Patreon wall at this time, so you'd need to pay for that.
In the end, I trust Ben's eyes for this analysis considerably more than a random scorekeeper, but he can't do it for every game, and as his work has taken off, he's more focused on watching games to create videos to explain on a team-level what's happening than he is to make stats.