Seven 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. Then he went back inside, pushed a few buttons on his computer, and now we have playoff odds for 2021!
Okay, fine, that isn’t exactly how it went down, but it’s close. Our playoff odds incorporate little 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 in hand, we use BaseRuns to estimate how many runs each team will score and allow per game based on our earlier blended rate statistic projections. 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 season 10,000 times, with an odds ratio and a random number generator determining the outcome of each matchup. Voila! Our playoff odds.
Why am I telling you all of this? First, so you can look at them. They’re accessible from the main page, but you can also click here to dive in. Second, because I’m going to walk through some projections I found interesting, as well as a few places where the gap between common perception and our odds merit an explanation. Let’s get started! Read the rest of this entry »