Nothing
bta <- BTabilities(nfl.model)
nflRatings<- data.frame(
team = rownames(bta),
rating = bta[,"ability"],
se = bta[,"s.e."],
wins = as.vector(table(nfl$winner)),
losses = as.vector(table(nfl$loser))
)
rownames(nflRatings) = NULL
nfl$winnerRating <- nflRatings$rating[as.numeric(nfl$winner)]
nfl$loserRating <- nflRatings$rating[as.numeric(nfl$loser)]
nfl$upset <- nfl$loserRating > nfl$winnerRating
nflRatings[rev(order(nflRatings$rating)),]
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