Outs Above Average (OAA)
is the cumulative effect of all individual plays a fielder has been credited or debited with, making it a range-based metric of fielding skill that accounts for the number of plays made and the difficulty of them. For example, a fielder who catches a 25% Out Probability play gets +.75; one who fails to make the play gets -.25.
Read more about how Outs Above Average (OAA) works here.
Runs Prevented is the position-adjusted translation from outs saved to runs saved. Read more about it here.
: For 2B, SS, 3B, OF: 1 fielding attempt per team game played. For 1B: 1 fielding attempt per every other team game played.