Nothing
NFL <- NFL %>%
mutate(
winnerRating = nflRatings$rating[as.numeric(winner)],
loserRating = nflRatings$rating[as.numeric(loser)],
upset = loserRating > winnerRating,
pwinner = ilogit(winnerRating - loserRating))
# how big an upset was the Super Bowl?
NFL %>% tail(1)
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