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July 10, 2009

Simple xBABIP Calculator

Filed under: MLB — The Wizard @ July 10, 2009 12:14 pm
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Derek Carty:

For those who have been hanging around these parts since this past off-season, you’ll surely be familiar with Chris Dutton and Peter Bendix’s work on creating an expected Batting Average on Balls in Play metric (xBABIP). This was terrific work, which I later examined a little closer to find that xBABIP was indeed a very strong predictor of future performance.

Today, I’d like to announce that I’ll be working with Chris Dutton to develop an even more advanced version of xBABIP. This is something that I’ve been thinking about for quite some time, and when I heard that Peter Bendix had taken a job with the Rays, I thought it made perfect sense to team up with Chris myself. We don’t currently have an estimate for when the new xBABIP will be ready, but hopefully the payoff will be a good one.

To wet your whistles while you wait, Chris has put together a very nice Excel tool for calculating a simplified version of xBABIP. This is almost identical to the version that I tested in my article that I linked to above, which turned out to be quite predictive itself. The tool also does a number of other cool things, so Chris took the liberty of putting together a quick explanation/tutorial for everyone. …

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