BasketballProspectus writer Kevin Pelton, armed with a database of player information, can help us answer that question. "My SCHOENE projection system," he explains, "uses 13 different categories, standardized to the league as a whole, to determine the similarity between two players. Though production is important, the focus is at least as much on how the player plays, which is why height and weight are two of the categories as well as stylistic markers like how often a player attempts three-pointers and free throws." (SCHOENE, by the way, is a really involved acronym, which, in the tradition of such stat systems, is shoehorned to fit the name of a former minor professional. Pelton explains the name and the system.)
His system does not compare entire careers, but we can approximate as much by taking a standout season from a particular player, and then finding the most similar player in this current season.
Then Pelton gives everyone a "similarity score" as determined by his 13 categories. "In practice," he says, "a score of 98 is virtually identical, 95 is very similar and anything below 90 is getting sketchy -- least dissimilar instead of most similar."
What I like most about this system is that it uses the statistics sheet to expand the conversation. Of course we have all heard a thousand times that Steve Nash is like the John Stockton today (again with the white-to-white comparisons!) but Pelton's numbers don't see skin color, and tell us that thanks to their steal rates, Stockton is much more like Rajon Rondo than Steve Nash. And the conversation expands.
John Stockton
In the 1989-90 season John Stockton had the highest PER of his career -- about 24 -- but made just about half a 3-pointer per 36 minutes he played. His shooting percentages were high from everywhere, and he managed a shocking 14 assists and 2.6 steals per game. Who plays anything like that today? The normal first guess is that Stockton is like Steve Nash, but Pelton's numbers say Rajon Rondo and Chris Paul are more like it."The biggest reason Nash doesn't show up," explains Pelton, "is that while Stockton was one of the league's best thieves, Nash collects steals at a rate way below league average."
Rajon Rondo 92.0
Chris Paul 91.0
Deron Williams 86.5
Jose Calderon 84.8
Devin Harris 84.7
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