RingColluder wrote:esqtvd wrote:RingColluder wrote:
Sir, plus minus (with all due respect) is a worthless stat. The fact that you derive virtually all of your analysis from it is very limiting.
So Bev went 0-4 on Tuesday 21 minutes 0 pts but was +11
TMann was 7-7 20 points 21 minutes and only +1.
This is REALLY how you determine your ideas of who is best to play??
You keep repeating yourself now. MERCY. You tried to use the plus/minus stat and it proved you WRONG. Now you reject it again.
At his best, Bev is our 3rd or 4th most effective player. WE must do everything to get him back in form if possible. Mann is our 10th man at the moment. If Bev's minutes go anywhere, they will go to Reggie and Rondo.
https://www.nba.com/stats/players/traditional/?sort=PLUS_MINUS&dir=-1&Season=2020-21&SeasonType=Regular%20Season&TeamID=1610612746

This is just dense man deriving the pecking order of the team purely from +/-. In no universe is Mann the 10th most effective player on the team. There are plenty of articles and highly respected coaches and others who say how useless +/- is, but we'll just agree to disagree.
I have discussed +/- before with esqtvd, and I got busy and never responded to his last post about it last time, but I think we should be more clear here.
The first thing I would be clear about is that single game +/- is what many coaches, etc rightly say needs to be taken with a grain of salt. Secondly, unadjusted and unanalyzed +/- is the second issue they tend to have. Coaches and teams in general are not using plus/minus for single player analysis (unless it's advanced and adjusted for lineups, luck etc,etc), but for lineup analysis, and with solid sample sizes, so not one game for example.
So for example, if we compare the raw +/- of a player A playing 30 mpg and a player B playing 15 mpg, we already have one problem, minutes difference means that technically player A would have double the +/- if both him and player B's lineups are beating the opponent by the same margin per minute.
So problem #1 is that we'll see people compare +/- of players on the same team playing largely different minutes and not adjust for minutes, which will always make the higher minute guy seem better than what the data is actually saying.
Second problem of course is that player A is playing with starters at least a lot more if not all his minutes, and therefore with the teams best players. If player B is getting a lot of minutes with a bench unit(s) that is comparatively weaker than other teams bench units, +/- will suggest they are weaker or lower impact when they might not be. Similarly, player A with the starters and stars might have their +/- simply overrated by playing with lineups which would be similarly positive regardless of who you subbed into their spot.
Hence why +/- needs a lot of analysis and adjustment, and teams in the analysis are generally doing adjusted +/-, but they can/will still use larger sample basic lineup data as a big picture look at lineups, but not for single players; at least the majority won't, can always find some outlier.