January 2006
Beginner
467 pages
14h 21m
English
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Measure Pitching with DIPS
Measure a pitcher’s performance independent of the fielders’ performance using DIPS.
In December 1999, baseball fan Voros McCracken came up with a new method of measuring pitching. McCracken started to wonder whether a pitcher could really do anything about balls in play; were outs from balls in play a function of a pitcher’s skill, the defense’s skill, or dumb luck? He set out to test this hypothesis and discovered (much to his surprise) that it wasn’t pitcher skill. He concluded that what happens after a ball is put in play depends on the defense. Only on walks, strikeouts, and home runs is the defense not involved.
To help measure a pitcher’s performance independent of the fielders’ performance, McCracken came up with a system he called defensive independent pitching stats (DIPS). If you want to know more about the story behind this formula, Michael Lewis’s book Moneyball has a nice write-up on Voros McCracken. If you want to learn how the formula works, read on.
The Formula
The formula for DIPS is, unfortunately, a little complicated. See the sample code that follows for an explanation of DIPS calculations. I’ll just launch into the code to explain how to calculate this measurement. (I used Voros McCracken’s own explanation for DIPS 2.0 numbers to make the following calculations.)
The process proceeds in two phases. First, a set of defense-independent measurements are calculated: DIPS intentional walks allowed (dIBB), DIPS hit batsmen (dHP), DIPS total ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.