Six Takeaways From Our Playoff Odds

Earlier this week, as is tradition, FanGraphs founder David Appelman went into his garage, turned off all the lights except for some candles, and performed a dark and arcane ritual. The words were carefully chosen and spoken precisely, with any variation promising disaster. Then he went back inside, pushed a few buttons on his computer, and now we have playoff odds for 2023!
Okay, fine, that isn’t exactly how it goes down, but it’s close. Our playoff odds bring together pieces of a lot of features you’ve already seen on the website. We start with a blended projection that incorporates ZiPS and Steamer’s rate statistic projections. We add in playing time projections from RosterResource, which incorporate health, skill, and team situation to create a unified guess for how each team will distribute their plate appearances and innings pitched.
With playing time and production in hand, we use BaseRuns to estimate how many runs each team will score and allow per game. That gives us a schedule-neutral win percentage for each team, because you can turn runs scored and runs allowed into a projection via the Pythagorean approximation. From there, we simulate the entire season 20,000 times, with an odds ratio and a random number generator determining the outcome of each game on the schedule, and voila! Our playoff odds. Read the rest of this entry »