I had the pleasure of presenting a data visualization workflow to the Boston Predictive Analytics Group with Tanya Cashorali last night (huge thanks to Bocoup for providing the meeting space and John Verostek for organizing the event).
The workflow we presented involves using a library called PitchRX in R to scrape pitch data from the PitchFX database, which Tanya covered (she also has a write-up on her website sportsdataviz.com), and then connecting Tableau Public to the data set to see what’s going on. We mined and visualized pitches by Jonathan Papelbon from the 2008 through the 2012 MLB season, or around 6,000 pitches in total.
Here’s the dashboard I put together for the group:
This is a first cut at what an exploratory (as opposed to explanatory) dashboard could look like, and I’m not quite sure what all the stories in the data are yet, but here are some tidbits that popped out to me:
- If you want a good chuckle, select just the pitches that resulted in balls and check out the gift Brandon Boggs was handed by the umpire on the 0-1 fastball of his at-bat during the 9th inning. That’s the nature of the game, I suppose.
- Also, filter to just strikes and ponder what Sean Rodriguez was thinking when he swung at the 0-2 pitch in the dirt during the 16th inning. Maybe I’d swing at just about anything in the 16th inning too, so I should be careful to criticize.
- Next, I was surprised to see that Papelbon actually threw more pitches to left handed batters (54% of all pitches) over the course of the past 5 seasons. Really, more lefties?
- Lastly, sliders are almost exclusively thrown to right handed batters (81% of all sliders were pitched to righties). That’s a good insight for the scouting report, I’d imagine. I’m guessing baseball geeks will be able to find a ton more here.
The real point here is that there’s room for multiple tools in every data worker’s toolkit. Tanya and I showed how you can combine different tools in a complementary way to get the best results. In this case, R does all the plumbing, and Tableau handles the fixtures and window dressing.
Thanks for stopping by, let me know if you have any feedback about the dashboard, or if you’d like to see the how-to.