colts18 wrote:OhayoKD wrote:colts18 wrote:I don't know why you keep repeating yourself:
That was paragraph 2. Why notify me if you're just going to talk to yourself?
You can use your same logic with Blocks. Blocks are often a team play and missed Block attempts that lead to Rebounds or the defender being out of position aren't in the box score either.
I
have used that same logic on blocks. And have specifically criticized BPM for saying blocks from smaller players are more valuable when they're generally
less valuable. That the value of blocks may be more misrepresented does not challenge that the value of steal-accumulators may
also be overrated. And if you were actually following what I was arguing, you'd have realized my case doesn't hinge on the global value of an individual steal vs an individual block. Again, read:
The 3 guys with the best track record of making defenses better are in the bottom 4(Lebron's only here at all because of longetvity). The number 1 on this list grades out as a marginal positive in APM. No -7 or > defenses are represented, and the top 5 players are all guards; players whose arrivals, departures, and declines consistently have the least correlation with team defense improving in every single iteration of the league including the current one.
The question is how valuable. History shows that the highest-steal accumulators are guards and history also shows that guards consistently pale in comparison to even wings, let alone big-men in defensive value. That stays true if you use raw signals or lineup-adjusted ones. When D-BPM is consistently disagreeing with reality on the value of a certain archetype, it probably overrates the archetype. Furthermore...
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As was explained in the forum post you linked me to, box-score aggregates miss most defensive actions, including
negative ones like blown steal attempts. They will also miss all the rim deterrence bigger players offer(the threat of being stopped matters too) which often allows smaller players to rack up blocks
and steals. There's also no box-stat for communication and organization, missed rotations, blowby's ect.
The result is that the accumulation of blocks and steals gets disproportionate emphasis which leads to (physically)"active" defenders("steal accumulators") contributions being treated as significantly more important than they actually are while simultaneously suffering no penalty for plays where they hurt their team defensively(which can happen when you're hunting for steals).
Setting aside that the RAPM set you linked uses a box prior, none of the players you listed grade as top-tier defenders with lineup-adjusted(that includes RAPM) or raw data excepting Hakeem who ranks outside the top 30 in spg and at the bottom of your accumulative list. Lebron looks like a top tier defensive
non-big with all the metrics/stats(adjusted or raw) but only makes your list thanks to his longevity(he ranks outside the top 70 in spg). Pippen is the best example here but he's still well behind the guards. Consequently Pippen grades out at as a weaker defender than Jordan per Dbpm even though it was Pippen's ascension, not Mike's that sparked the bulls defense becoming elite.
As far as Dbpm is concerned, Lebron and Stockton are peers. RAPM doesn't agree. Pure signals don't agree, and the quality of the defenses they've led doesn't agree. As it so happens, when we look at more predictive metrics like LEBRON, we see that almost every team's most valuable defender is an "anchor big", not steal-accumulating guards.
This leaves us with two possibilities.
A. DBPM overrates steal-accumulators
B. DBPM is right and everything that's more directly tied to winning is wrong
I'm going with b, you're welcome to die on the hill of a