what does OPS+ technically measure

[sturg1dj]

I have had it used to "prove" to me that player A is better than player B....yet in some cases I just cannot accept it.

[Tango Tiger]

Technically, it doesn't measure anything.

Realistically, it tries to balance a player's hitting line (no baserunning) properly, such that it aligns itself with runs created.

Once you graduate from the elementary school of OPS, you go to the high school of OPS+. When you want to go to college, look up Linear Weights and BaseRuns.

I suggest you go here:

http://www.tangotiger.net/wiki/

[digglahhh]

In simplest terms it takes a player's (park-adjusted) On base and slugging and compares it to the league average, on a scale of 100.

Here's the formula (BBRef):

PRO+ = 100 * ( OBP/lgOBP + SLG/lgSLG - 1)/BPF

Take Stan Musial 1948:

I'm going to plug Musial's #s into the formula:

100* [(.450/.351) + (.702/.408) -1]

1.28 + 1.72 = 3

3-1 = 2

100*2 = 200.


As you can see above, Musial was 72% better than the league at slugging and 28% better than the league at getting on base.