What is uzr

I know this is a year old post, but just in case someone reads this, how come Jose Lopez has a UZR of 8. I have to assume its not as simple as UZR divided by games played at the position, multiplied by …?

Information Report. Still has a long way to go. For example, anyone who has seen A. Cabrera play knows he is one of the best defensive shortstops in the AL.

Yet he is ranked dead last. Suzuki is also very underrated. UZR by Piper Slowinski. Calculation: For the details on how UZR is calculated — i. Please Login to comment. Most reacted comment. Hottest comment thread.

Recent comment authors. 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. Essentially this step gives the fielder bonus points in this case, 0. Meaning that 0. The easier the play, the more he is penalized. After this value is calculated, adjustments are made based on the conditions of the play.

Adjustments include:. After this process, we are left with an adjusted UZR. Adjustments are necessary to determine a more precise value and to consider the conditions of the play that may have impacted its result. UZR is based on positional average, so the zone helps divide the field and identify who should gain or lose points for a play.

The field is split into 78 zones. In each zone, the out rate and the percentage of balls that result in outs are calculated. This determines the probability that a play will be made in a certain zone.

This stat can be really easy to understand if we take a step back and conceptualize. For now, we can provide you with four elements that are used within UZR calculations, so you can have a basic understanding of what is included:. Overall, breaking 15 in UZR for a single season is going to place a player near the top of the league, and anyone over 10 is a quality defender.

Obviously, those in negative territory are below average defenders, and will likely need to contribute notably with the bat to be of value to their teams.

There is a human element involved with UZR analysis, as people have to review each play to determine the value added. This obviously comes with a margin of error, so UZR has its limitations. Skip to content UZR Definition There are plenty of statistics available for offensive and pitching performances, but defensive evaluations have historically been rather limited. Why is UZR Important?

How is UZR Calculated? For now, we can provide you with four elements that are used within UZR calculations, so you can have a basic understanding of what is included: ARM: This is Outfield Arm Runs, and it assigns each outfielder a number of runs above or below average with regard to preventing base runners from moving up.

RngR: Range is a big part of playing good defense, and some defenders naturally cover more ground than others. Range Runs provides a value to that coverage. ErrR: While fielding percentage is not particularly useful in a vacuum, errors are still a part of defensive evaluation.