Many of the colunms I wrote discussing the PITCHf/x data made available through MLB.com's Gameday system are now available sans subscription on Baseball Prospectus. Those articles are:
Schrodinger's Bat: Free Stuff and the Men in Blue.
Postseason umpiring and an early holiday present for our readers.
Schrodinger's Bat: On Atmosphere, Probability, and Prediction.
Ranging across a couple of old and new themes, explaining that there's something about the weather, and Pythagoras can rock steady.
Schrodinger's Bat: Visualizing Pitches.
After digging through this data, you'll no longer wonder why they say hitting is the hardest thing to do in sports.
Schrodinger's Bat: Putting the Pedal to the Metal.
What happens when pitching in a pinch? Do pitchers have something extra that they can put on the ball when they're in a jam?
Schrodinger's Bat: Calling the Balls and Strikes.
A look umpire tendencies to see how much human error plays a role in calling pitches.
Schrodinger's Bat: Searching for the Gyroball.
Is it there, or isn't it? Dan dives into Dice-K's data to find out.
Schrodinger's Bat: Playing Favorites.
Parsing the data can help us address questions of bias among umpires in calling balls and strikes.
Schrodinger's Bat: Gameday Meets the Knuckleball.
Dan continues his series using pitch data by examining the case of Tim Wakefield.
Schrodinger's Bat: The Science and Art of Building a Better Pitcher Profile.
Popping the hood on King Felix as a demonstration of what's possible with PITCHf/x data
Schrodinger's Bat: Gameday Triple Play.
How different ballparks affect velocity, whether pitchers use the fastball more early in games, and the challenge of quantifying plate discipline.
Schrodinger's Bat: Physics on Display.
Further adventures in pitch-by-pitch data.
Schrodinger's Bat: Batter Versus Pitcher, Gameday Style.
Evaluating the strike zone, the umpires, and some large-scale issues with a tremendous new tool.
Schrodinger's Bat: Phil Hughes, Pitch by Pitch.
Dan uses MLBAM data to reconstruct the no-hitter that wasn't.