by Stoney18 » Mon Nov 10, 2008 5:10 pm
Here's some thoughts on Zone Rating
[quote:1031224287]Why Zone Rating is BS for infielders: ZR=OUTS/(GROUND BALLS IN ZONE + GROUND BALLS OUT OF ZONE IF THE PLAY IS MADE). Snag a screaming liner two steps to your left? Sorry, doesn't count towards your ZR. It's not a groundball. Duck out of the way of a liner at your chest? Good news! Doesn't count against your ZR, it's not a groundball! Remember Derek Jeter diving into the 2nd row after that popup? Well forget it. The formula says it had nothing to do with his range, because it wasn't a ground ball.
Why Zone Rating is BS for outfielders Part 1: Climbing the fence and stealing a homerun counts exactly as much as standing in your tracks while a lazy fly drops into your glove. Well, maybe less (see "Why ZR is BS for outfielders Pt 2," below)
Why Zone Rating is BS for outfielders Part 2, a Thought Problem: 5 lazy flyballs are hit straight at the Banana Slugs CF (in zone), and 1 is hit into the left-center field gap (out of zone). He catches all 5 lazy flyballs, and gives up a triple on the gapper.
5 more flyballs are hit straight at the Spitfires CF (in zone), and 1 is hit into the left-center field gap (out of zone). He catches 4 of the lazy flyballs, makes a great diving stab on the gapper for an out, but gives up a single on the 5th lazy fly.
Who has the better range factor?
Banana Slugs: 5 plays made/ 5 balls in zone = 1.00 ZR (remember, the ball out of zone doesn't count against the denominator if the play is not made)
Spitfires: 5 plays made / (5 balls in zone + 1 ball out of zone) = .833 ZR
So there you have it. The same number of chances, the same number of plays made, but different Zone Ratings.
But wait, there's more! The player who made the play that required more range gets the lower range rating.
Why? Because the Zone Rating formula tells us that it's so. [/quote:1031224287]
I think there has to be some judgement in the process not just stats.
FYI, I don't know who the original poster of this info was to give them appropriate credit.