The value is represented in relation to the positional average, meaning the average UZR differs based on position. What qualities do you like in a position player?
Personally, I like when fielders are fast because they can reach more balls. I also like when they make good throws to get outs, and commit few errors. In the most basic sense, UZR attempts to consider these qualities that make up good defensive players and combines them into one statistic.
Zero is considered the league average UZR value. This is because after the UZR for a player is determined, it is then adjusted see below for more details to a league average 0 value for the position. Anything greater than zero indicates that a fielder is above average skill level and makes plays that average fielders may not be able to. Anything less than zero indicates that a fielder may have a tendency to miss plays, even average ones from time to time.
A little more complicated, the actual terminology and definitions of the metrics considered in the UZR are:. When a fielder makes a play, the play is a certain level of difficulty. For example, a routine fly ball is easier to catch than a fly ball that the fielder needs to run for.
The level of difficulty is related to a percentage for how likely it is that the play is made. That completion percentage is attached to a run value. In general, plays with higher completion percentages correlate to less runs.
Stuff like this is counted in the "rGFP" column on Fangraphs. Outfielder arms are measured. Catchers and pitchers are given credit for controlling the running game. Because if a second baseman botches a play that allows a baserunner, why should we ignore the bad play just because the pitcher struck out the next two batters to escape unscathed?
The second baseman still made a bad play, and what happens next is irrelevant. So we calculate everything on average, that way, we know what that single play was worth, isolated from everything else that may have happened.
The end result is that the first baseman gets some extra credit, while the infielder who made the bad throw will get docked. What about shifts? DRS then circles back around and computes runs above average on shifts separately, on a team-wide basis. What about first baseman positioning?
DRS takes out all first baseman plays with a runner on first, then calculates them all separately. Cookie banner We use cookies and other tracking technologies to improve your browsing experience on our site, show personalized content and targeted ads, analyze site traffic, and understand where our audiences come from. By choosing I Accept , you consent to our use of cookies and other tracking technologies. Stories Schedule Roster Stats.
Reddit Pocket Flipboard Email. Click to see the gif. In other words, this stat helps to compare the value of a defensive specialist with the value of a player who hits well but contributes little in the field. Andrelton Simmons has a reputation as one of the best defensive shortstops in baseball, and his season was no exception. His UZR for was At the plate, he recorded a 5. Since both of these stats are measured in terms of runs, we can see that Simmons was more than three times as valuable in the field than at the plate.
For contrast, we can look at the statistics for J. Martinez of the Boston Red Sox. In , Martinez was easily one of the best hitters in the league, batting. His wRAA was a staggering If you compared Martinez to Andrelton Simmons on hitting alone, there would be a massive gap in their respective values. However, Martinez had a UZR of By adding defense to the mix, the gap between the two is narrowed, and we are able to gain a better appreciation for what Simmons brings to his team.
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