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Brooks Baseball Joins Baseball Prospectus

I'm very excited to announce that Dan Brooks, Harry Pavlidis, and Brooks Baseball have agreed to team up and join forces with Baseball Prospectus. BrooksBaseball.net is the premier site for PITCHf/x analysis and pitch classification. Harry has spent countless hours breaking down the movement, trajectory, and speed of each pitch thrown by every pitcher since 2007, making analysis simple and easy for anyone interested in examining major-league pitching.

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What does it take for assorted pitching stats to stabilize?

Last week in this space, I updated a study originally run four years ago by former BPer Russell Carleton (then monikered “Pizza Cutter”) at the now-defunct MVN’s StatSpeak blog. The study examined how long it takes for different stats to “stabilize.” Since I looked at hitting last week, I’ll be looking at pitching this week.

Before I get started, I wanted to make one quick announcement. After my first chat was such a success, I’ll be holding my second-ever live BP chat tomorrow afternoon at 1 p.m. EST to answer all of your fantasy questions.

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In a return look at Russell Carleton's original study, Derek tries to find at what point stats stabilize and can be trusted.

Four years ago, former BPer Russell Carleton (then monikered “Pizza Cutter”) ran a study at the now-defunct MVN’s StatSpeak blog that examined how long it takes for different stats to “stabilize.” Since then, it has become perhaps the most-referenced study in our little corner of the internet.

It has been a while since the initial study was run, and since there are a few little pieces of the methodology that I believe could be improved, I decided to run a similar study myself.

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July 7, 2010 8:00 am

Checking the Numbers: Weaver's Soaring Strikeout Rate


Eric Seidman

It appears Jered Weaver's mastery of a relatively new pitch has allowed him to punch out hitters like never before.

When Jered Weaver made his major-league debut on May 27, 2006, the Angels were 20-28, in last place in the American League West, and five games behind the division-leading Rangers. After the mega-prospect blanked the Orioles over seven strong innings to the tune of a 75 game score, Angels fans were more than enthused that their rotation had been vastly improved by his addition. Weaver would finish the season with a 2.56 ERA in 123 innings with an impressive 3.18 K/BB ratio and 1.03 WHIP. He walked few, proved stingy with allowing hits, and recorded his fair share of strikeouts. Though his rookie numbers were impressive, many would agree that Weaver’s lack of progress since then has been disheartening.

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May 6, 2009 11:55 am

Zumaya's Zooming


Ben Lindbergh

Diagnosing how a phenomenon gets hot, goes bad, and comes back might involve changing things up.

Three years ago, Joel Zumaya took the AL by storm, flashing an overpowering fastball on his way to a full season of stellar relief. Since 2006, though, he's fallen on hard times. Now that the big righty has recently reclaimed his role in Detroit's bullpen, let's take a look at his prospects for future success by using all of the tools at our disposal.

Zumaya broke camp as a member of the Tigers' bullpen in 2006, after fellow rookie Justin Verlander had claimed a rotation spot in spring training. Except for a single appearance in relief as a 17-year-old in the GCL, Zumaya had worked exclusively as a starter in the minors, but his migration to the pen didn't come as a complete surprise. Although Baseball America ranked him among Detroit's top four prospects in each year from 2004-2006, talent evaluators frequently cited his intensity, max-effort delivery, inconsistent mechanics, limited repertoire (before 2005), and three DL stints (for back and shoulder spasms) as factors arguing for a shift to short relief work.

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