August 26, 201610 yr It's more than that. It's balls-hit-that-direction-that-resulted-in-outs. So it's FP% plus zone defense plus catching baserunners, with double plays and fielder's choices thrown in for fun. Though the specific formula for UZR is secret knowledge (do you know the formula?), I strongly suspect F2O% is a factor. This means it's factored into fWAR as well. The zdefense guy is using it and getting similar numbers to UZR. z-defense (the overall stat that combines z-outs, z-range and z-fielding) tries to factor in all those things, F20% doesn't. F20%, by itself, doesn't even use range. it's Field to out, period. It is supposed to be combined with RZR. http://www.fangraphs.com/community/a-zdefense-primer/ The guy who created z-defense is trying to create his own version of UZR with some different components mixed in. If he used exactly the same as UZR, what would be the point? :-) Edited August 26, 201610 yr by jimmer
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