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Here's a good rollup of the math-with-letters part of PER.1) Zach has almost become a "solid NBA player," and I'm hopeful he can get there by the time the playoffs start.
Right now, he's still inconsistent.
2) His comfort level has clearly increased, and that's been huge.
3) He meshes well with Ed Davis.
4) I've been saying all along that he's a 2-way player, and I think we're starting to see that. In particular, I
think he's become a solid 3 and D player.... which is exactly what you want when you have stars like Dame and
CJ on the team already.
5) He still has weaknesses, and the refs still hate him, but it's fun watching him improve.
6) Depending on what happens in the offseason, it's reasonable he becomes a starter midseason next year.
7) His PER is still only at about 8, but I honestly don't know if that's a low usage thing or not.
In general, Zach has a few things going against him having a high PER:In three careful examinations of PER, we find that PER benefits players on teams that pass well, make more than 2.5 times as many field goals than free throws, and tend to gather more offensive rebounds than defensive rebounds. We also identified that PER heavily benefits volume shooters and if they manage to be at minimal terrible shooters, that can use that to inflate their numbers to look better than their All-Star and All-NBA quality peers.
This doesn’t show that players with high PER are terrible, however. What we do say is take this measure with a grain of salt and surround it with qualifying metrics. We quickly see that this measure favors perimeter shooters, as well as poor free throw shooters who score a sizable amount of points from the field. The above explanations capture these rumblings.
1) He's not a volume shooter.
2) He's on the Blazers (no kidding, A/FGM ratio is decent part of the makeup of PER. Someone on the Warriors will have a higher PER than the Blazers, if every single stat stayed the exact same.)
3) He's usually on the floor with an exceptional rebounder, especially an exceptional offensive rebounder.
4) He dug himself a hole early in the year and it's going to take an extended run of good "stats" play to bring him back to him mean. Even now he's at 34% from 3 for the year, which while not stellar, makes it a worthy shot (and trending upward quickly).
(he does, however, shoot from the perimeter a bunch and doesn't get a lot of fouls called. So that removes one particular downward-forcing function. But not nearly enough to overcome the others)
If I were a GM or talent evaluator, I'd note those particular aspects of Zach's game and how PER wouldn't be the best wrap-up stat for him. Now, I'd also look at that to find diamonds-in-the-rough on other teams ("what do you mean, a first for Royce O'Neal? His PER is only 11--hee hee") and use it against more Front Offices that talk a good analytics game but don't really understand it. (There are more than a few of these)

