- Nick Markakis has played 7874 innings for the Orioles in RF.
- Adam Jones has played 3405 innings for the Orioles in CF and 227 for the Mariners.
- Felix Pie has 852 inning for the Orioles in LF and 13 for the Cubs.
Here is a short description of UZR if you need to be refreshed on how it is calculated.
How to calculate UZR: The baseball field is divided into 78 zones, 64 of which are used in UZR calculation. (As Lichtman explains, infield line drives, infield pop flies, and outfield foul balls are ignored. Pitchers and catchers are not included.)
Here's what is calculated for each zone: the out rate and the percentage of balls in that zone that turn into outs. The league average out rate is then subtracted from the player's out rate — if this number is negative, it means the player is worse than league average. If it's positive, it means he's better than league average.
That rate is then multiplied by the number of balls that hit in that player's zone. This yields a Zone Rating. To obtain the run value, it's multiplied by the Zone Ratings that are calculated for each zone the fielder covers, and then summed. This sum is a simple, unadjusted UZR. It is then further adjusted for park factors, batted ball speed, which side of the plate the batter was hitting from, the pitcher's groundball/flyball ratio and the number of baserunners and outs at the time. The adjustments are made because each of these variables can significantly affect the average out rate in a particular zone. Using run expectancy charts, these rates can be converted to runs.
UZR / 150
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The question now lies as to whether we can discern what part of UZR has the problem and whether it makes any sense.
No pattern appears with arm values. This makes sense as throws are contained within the playing field. It would be unlikely if a stadium could play much havoc with throws outside of wind issues, which apparently is not the case with Camden Yards.
Incidence of Errors
Incidence of errors also does not appear to be greatly affected by Camden Yards. This is also expected as grounds crews do a fairly good job ensuring that each stadium has an excellent field.
Range is where we see the issue. I am not entirely sure what the problem is. Range is basically determined by how plays are in a players' area and how many he winds up catching. Somehow, Camden Yards is a difficult place to track down baseballs. I am not sure if there is an issue with see the ball come off the bat, if high flies are greatly affect by wind, or something else. Unfortunately, I do not have any data for how visiting teams perform here. UZR does account for park factors and one would think such a shift in fielding would be figured into the final number.
What if the numbers are correct?
I do not have a solid conclusion after looking at this data. If the Orioles are doing this poorly at Camden Yards and UZR adequately adjusts for park factors then it would mean that every other team on average is playing about 2 WAR better defensively. While also meaning that when the Orioles are on the road, they outperform various home teams about the same. I just have a hard time understanding how the numbers can be accurate here. I inclination is to think there is a significant failing in UZR in the outfield at Camden Yards.