Rookie
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Re: MyLeague Regression - (Because the issue should not be forgotten)
I think it might be helpful if we started by thinking about what happens in the real world. I've posted before the percentage breakdown of NBA players. Basketball-reference.com has an easily sortable table that includes players age and is downloadable in excel format, so I compared this year and the 2011 season.
First, age breakdown for this year:
483 players are listed--essentially anyone who actually played a game this year. Their ages are as follows:
38: 4
37: 5
36: 4
35: 6
34: 17
33: 13
32: 19
31: 16
30: 23
In total, 22% of the league is age 30 or older, 14% is OVER 30, and 3.9% is 35 or older.
So, it seems like the issue is that people are complaining about players regressing too much, too soon. In general, the data suggest that NBA players peak around age 26, and indeed, this season, 26 year olds are the single largest group in the NBA. So I decided to compare 30 year olds to their former selves at age 26, and went back to the 2011 season to see who was in the league then and what became of them. I also looked at 28 year olds and 30 year olds. There was an unusually large cohort of 30 year olds in the NBA then, a total of 37 players.
Comparing 2011 and 2015:
-40 players aged 26
-22 still in the league now (one addition is Chris Copeland, who joined the league in 2012)
-If average PER is 15, NONE of the players out of the league now were even league average at age 26
-Most notable players out of the league by 30: Brandon Roy, Sasha Vujacic, Travis Outlaw
-31 players aged 28
-15 still in the league
-Notable players out of the league: Will Bynum (PER 15.1), Hakim Warrick (PER 16.5, Luther Head, Kwame Brown
-37 players aged 30
-18 still in the NBA at age 34
-notably no longer still in the NBA: Yao Ming, Keith Bogans, Dahntay Jones, Al Harrington, Troy Murphy
From 31 to 35, the drop is even more pronounce:
-19 players 31 years old in, only 6 still in the NBA at age 35 (Jannero Pargo was out of the league for that one season, so it's 5/19 + Pargo
-Notably out of NBA now: Lamar Odom, Tracy McGrady, Corey Maggette, Metta World Peace, Baron Davis, Rashard Lewis, Mehmet Okur. 5 of those guys were all-stars, Odom had a great career, and Artest was DPOY on top of that
-Worth nothing that many of those guys had productive seasons, including Odom (PER of 19), Davis (PER of 17), and Maggette (PER of 15.8).
-Rasual Butler is the only player left who has a PER of 15 or better
-Elton Brand is still around, but he has fallen from a PER of 18.6 to a PER of 11.6
Granted, I'm using PER as a catch-all metric, but you can use whatever measure you want.
This isn't a large enough sample size to build a real model, but the data is pretty clearly there. Injuries obviously play a huge role--but that's true in the game, too--I've seen guys regress horribly after injuries in 2K15. But this is why it's risky to give big contracts to veterans--that max deal you give to a 28 year old all-star might buy you a couple of good seasons, and then you'll find yourself spending tons of cap space on a mediocre role player.
I think the regression system in the game needs tweaking, especially because it'd be cool to see guys evolve better over time, a la Duncan/Dirk/Carter. But let's remember how truly rare those are.
This should give people doing testing at least some useful info to work with, I hope.
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