Description Usage Arguments Value Examples
The performance measure TOP1 is calculated as follows: after sorting the
observations by their predicted probabilities of relevance (phat
) in
decreasing order so the first ranked observation has the highest probability
of relevance, if the first ranked observation is truly relevant, TOP1 has a
value of 1. Otherwise TOP1 is 0. If there are ties for the first rank, all
the corresponding observations must be truly relevant for TOP1 to score 1.
1 |
y |
True (binary) response vector where 1 is the rare/relevant class. |
phat |
Numeric vector of estimated probabilities of relevance. |
... |
Further arguments passed to or from other methods. |
Numeric value of TOP1.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 | ## with ties in phat
resp <- c(0, rep(1, 99))
prob <- rep(1, 100)
TOP1(y = resp, phat = prob) # expect 0
resp <- c(1, 1, 1, rep(0, 95), 1, 1)
prob <- c(1, 1, 1, rep(0, 97))
TOP1(y = resp, phat = prob) # expect 1
## no ties in phat
resp <- c(0, rep(1, 99))
prob <- (100:1)*0.01
TOP1(y = resp, phat = prob) # expect 0
resp <- c(1, rep(0, 99))
TOP1(y = resp, phat = prob) # expect 1
|
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