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You can basically get OAA with EFF.
For 2B/3B/SS use Assists and for LF/CF/RF use Put Outs.
For example, consider a SS with a 1.030 EFF and 375 Assists.
375 - (375/1.030) = 375 - 364 = +11 OAA
For example, a CF with a 0.950 EFF and 350 PO.
350 - (350/0.950) = 350 - 368 = -18 OAA
On average, each OAA is worth about 0.75 ZR. So, every 12 plays in either direction is roughly worth a win.
What I like about that article is that is tells you that defense should not be ignored in team building.
Consider two teams with average pitching and offense but one team makes +35 OAA (about +4 or +5 OAA at each position) and the other team makes -35 OAA. The first team is going to win 84 games, and the second team is going to win 78 games.
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