FanGraphs Baseball


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  1. Very cool. I’ll be checking back to see what the data looks like as the year goes on.

    I wonder how the use of relievers impacts a team’s performance relative to Pythagenport W/L. Is there a relationship between the “proper” use of relievers and the team’s ability to outperform its Pyth? Also, this would be a cool longterm project, as a way to evaluate managers.

    Comment by Tactical Bear — April 27, 2010 @ 9:25 am

  2. Good stuff Steve. I was actually looking for a similar way to do this a few months back. I tried to use ERA estimator/Team ERA estimator as the ranking system.

    Comment by Michael — April 27, 2010 @ 9:46 am

  3. I think I’m going to have to do some intra team clustering or something… For some teams there’s not enough differentiation in projected ERAs for the ranking to be significant

    Comment by Steve Sommer — April 27, 2010 @ 9:51 am

  4. This is a great idea and of course will be more accurate and informative when the sample size is larger.

    As an Orioles fan it’s hard for me to believe that Dave Trembley has been using his bullpen that effectively. Two explanations for this disjoint come to mind: (1) does restricting your sample to “qualifying” relievers exclude Mike Gonzalez, who has been terrible in extremely high leverage situations but has only appeared in three games? (2) does using CHONE ERA rather than actual ERA make a difference for someone like Jim Johnson, who has an ERA over 7 in high-leverage situations but whose peripheral stats (K, BB, HR) suggest that he’s pitching a lot better than his ERA indicates?

    Comment by John Shea — April 27, 2010 @ 10:15 am

  5. Steve, I am totally stealing these for inter-team comparisons. I am worried they may be cluttered. Let me see what I can do.

    Comment by Jeff Zimmerman — April 27, 2010 @ 1:04 pm

  6. Steve, I’ve looked into bullpen usage, too, and I think you’ll also want to include platoon rates. Might be a bit trickier to quantify.

    Comment by Jeremy — April 27, 2010 @ 1:14 pm

  7. Definitely agree that they would need to be included.

    Comment by Steve Sommer — April 27, 2010 @ 1:57 pm

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