
Pythagorean record is one of those useful rules-of-thumb that every veteran baseball fan knows to consult when there’s an anomaly in the standings.
“Well, you see, the Mariners and the Rangers both have 74 wins - but the Rangers have a +173 run differential, and Seattle’s only at +102… I’d expect Texas to pull ahead.”
Regression to the mean is an incredibly powerful factor in sports, and Pythagorean record helps capture it much better than pure Win/Loss record, which is subject to the many idiosyncrasies of the sport and tends to be less predictive of future outcomes.








