I have been extremely curious as to what the difference between AAA and the Majors is. So here, in a relatively small sample, I set out to find some answers. I will use current Tampa Bay Rays players (along with a couple former ones) difference between their Major League careers and their AAA Durham Bulls career. Since Durham plays in the International AAA league, I think it will be safe to (currently at least) use the metric for all International AAA league players.
Wade Davis: In Durham: -1.642 PE, In Majors: 2.275 PE and .77 WAR a season
Carl Crawford: In Durham: 1.69 PPG, 2.55 PAPP, .335 OBP and 1.07 Simple WAR. In Majors: 1.48 PPG, 2.5 PAPP, .333 OBP, and 2.74 WAR a season.
Delmon Young: In Durham: 1.54 PPG, 2.66 PAPP, .325 OBP, and .423 Simple WAR . In Majors: 1.17 PPG, 2.93 PAPP, .321, and -.1 WAR.
Jeremy Hellickson: In Durham: -4.86 PE, In Majors: .32 PE, and 4.2 WAR in 2011 (his only full season)
J.P. Howell: In Durham: -3.435 PE, In Majors: -.021 PE, and .45 WAR a season
Jake McGee: In Durham: -6.713 PE, In Majors: -.986 PE, and .01 WAR a season
Jeff Niemann: In Durham: -.785 PE, In Majors: 1.3 PE, and 1.1 WAR a season
David Price: In Durham: -.699 PE, In Majors: -1.3 PE, and 3.33 WAR a season
James Shields: In Durham: -2.722 PE, In Majors: .24 PE, and 2.95 WAR a season
Andy Sonnanstine: In Durham: 1.182 PE, In Majors: 3.77 PE, and -.08 WAR a season
John Jaso: In Durham: .91 PPG, 2.74 PAPP, .356 OBP, and 1.81 Simple WAR. In Majors: .84 PPG, 2.83 PAPP, .340 OBP, 1.25 WAR a season
Reid Brignac: In Durham: 1.08 PPG, 3.03 PAPP, .316 OBP, and -.56 Simple WAR. In Majors: .63 PPG, 3.54 PAPP, .272 OBP, -.05 WAR a season
Dan Johnson: In Durham: 1.65 PPG, 2.19 PAPP, .412 OBP and 5.88 Simple WAR. In Majors: 1.01 PPG, 2.74 PAPP, .334 OBP, .58 WAR a season.
Elliot Johnson: In Durham: 1.23 PPG, 2.75 PAPP, .325 OBP, and .09 Simple WAR. In Majors: .61 PPG, 4 PAPP, .257 OBP, .1 WAR
Ben Zobrist: In Durham: 1.38 PPG, 2.24 PAPP, .416 OBP, and 5.14 Simple WAR. In Majors: 1.27 PPG, 2.56 PAPP, .348 OBP, 2.28 WAR a season.
Desmond Jennings: In Durham: 1.53 PPG, 2.3 PAPP, .375 OBP, and 3.4 Simple WAR. In Majors: 1.35 PPG, 2.488 PAPP, .351 OBP, 2.2 WAR
Matt Joyce: In Durham: 1.49 PPG, 2.19 PAPP, .404 OBP, and 5.11 Simple WAR. In Majors: 1.11 PPG, 2.58 PAPP, .345 OBP, and 1.75 a season
Justin Ruggiano: In Durham: 1.63 PPG, 2.36 PAPP, .362 OBP, and 2.53 Simple WAR. In Majors: .55 PPG, 3.39 PAPP, .262 OBP, and -.2 WAR
B.J. Upton: In Durham: 1.69 PPG, 2.21 PAPP, .391 OBP, and 4.48 Simple WAR. In Majors: 1.37 PPG, 2.48 PAPP, .342 OBP, and 2.41 WAR a season.
Pitchers: In Durham: -2.46 PE Average. In Majors: .7 PE Average, 1.59 WAR a season. Average pitcher going from Durham (or International League in AAA) would add 2.53 to their PE. WAR is not particularly helpful because the correlation between PE and WAR is skewed, because both PE (the lower the better) and WAR (the higher is better) are lower for pitchers.
Hitters: In Durham: 1.44 PPG average, 2.34 PAPP average, .365 OBP average, and 2.67 Simple WAR average. In Majors: 1.04 PPG average, 2.91 PAPP average, .319 OBP average, 1.18 WAR average. So on average, a player loses 1.49 from there simple WAR to their Major League WAR, lose .046 from their OBP, add .57 to their PAPP, and lose .40 from their PPG. So, for now at least, this is how we judge players in the International AAA league.
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