Since 2008 (really 2007), Pitchf/x data has tracked every pitch thrown in the major leagues. As a result, the sabermetric community has learned a great deal about how various pitches and pitchers themselves work by analyzing this data. Here's how it could be misused.

Baseball Stat Acronyms Pronuciation Guide

Earned Run Average distorts the contribution of pitchers in multiple ways, yet it is still widely used. Until everyone gets on board with a Runs Allowed scale, here are the easy conversions.

While it may not be impossible, it is clearly not only difficult to define the hit tool, but also to isolate it statistically. At least in theory, I think a combination of both line drive percentage and contact rate best exemplify the underpinnings behind the concept our experts articulated above.

Rick Reuschel leads all eligible non-Hall of Famers in Baseball-Reference's pitching Wins Above Replacement. (photo via Wikipedia) "My Thing" is comparing players across eras to formulate fun...

How do we get people beyond traditional ERA into more advanced statistics that separate defense from pitching? Presenting a stat that is the perfect bridge between old and new.

It's standard in baseball analysis to say that 10 marginal runs typically converts to one win. But that hasn't always been the case, and given the drop in scoring in 2010, is it still?

Readers of these fine pages know that I've been all wrapped up in a little thing I like to call wWAR (or, Weighted WAR) lately. Reader Chris Levy sent me an email asking about wWAR, so I figured I...

What is a good fastball? How can certain pitchers thrive upon pitching rather than just throwing

In response to overwhelming demand (ahem), here are are customized weights from 1871-2010 for calculating hitter value with linear weights.