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How reliable is UZR?
How reliable is UZR?
Ultimate Zone Rating is now everyone's favorite defensive stat on the Internet. But how reliable is it? Let's define reliable as year to year persistance. It's not the only definition, but it'll do. We'll measure it using weighted correlation coefficient. And for good measure, we'll take a ...
Year over (1/2)Year UZR Figures
fangraphs.com — Nearly half way through the season, I thought I would check in on the defensive numbers once... more. This time, I took the team totals from 2008 and so far through 2009 and going by UZR per inning, rank the teams in order from most improved to least.  ... (more) Year over (1/2)Year UZR Figures

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Winning Streak Applesauce - Mets Sign Urbina, Royals Ban Rany, Joey Chestnut vs. Kobayashi
Amazin' Avenue — ... the Boxscore adds some objectivity to the interleague attendance discussion. Jim Leyritz: douchelord. R.J. Anderson at DraysBay bids adieu to Winston Abreu. DodgerSims celebrates Christmas in July, with the return of Manny Ramirez. Mike Silva continues the "Should Joba be in the bullpen?" discussion for some reason, which is only a discussion for the Beningos and Francescas of the world. Colin Wyers at THT looks at the reliability of UZR.  A couple takeaways: ...

This Week's Links (6/29-7/3)
Vegas Watch — Posnanski questions Hillman's use of Meche. Wyers on the reliability of UZR. Brooklyn native Lance Stephenson signs with Cincy. Nate Silver is playing in the WSOP. Pos on The Great Mariano. The OC Register interviews Sean "CHONE" Smith. RAB looks at the accuracy of various MLB mock drafts. ...

Past Performance Does Not Guarantee Future Gains
Beyond the Box Score — ... And here's a graph: Eyeballing that chart, you are likely willing to discount his outlier season of 2009, despite the fact that it is the most recent. It was fueled largely by a career high 16.3 fielding runs above average (by UZR), and perhaps you don't trust UZR's year to year fluctuations (motivated by good reasons). So let's say you throw out his outlier 2006 and 2009 seasons, and expect him to be worth between $9 million and $12 million. We'll split the difference and say $10.5 million. Again, ...

Was Joe Mauer Streakier than Jimmy Rollins?
Beyond the Box Score — ... But it's very important to remember that even with these seemingly stable numbers, we can't be certain they represent true talent. As Colin Wyers has pointed out, even when a player has 300 PA, we still need to regress his wOBA almost 50% to the mean. However, that does not mean that, with 600 PA, we do not need to regress at all to the mean. ...

Related Content
Graph of the Day: UZR Comparisons for 2008 NL Playoff Teams
beyondtheboxscore.com 7/4/2009 — More photos » by Tom Mihalek - AP Browse more photos » Here is a quick look at the last season's four NL playoff teams comparing their UZR numbers.  First here are the team totals:  ...
UZR Hates The Mets Outfield
amazinavenue.com 6/30/2009 — The Mets have the 2nd worst Ultimate Zone Rating (UZR) in baseball, at -20.1 runs.  Only the embarrassing Nationals measure out worse.  This number jumps off the page because the Omar Minaya Mets have been strong defensively.  They ...