Description Usage Arguments Value Author(s) Examples
Calculate the exact area under the ROC curve.
1 | WeightedAUC(tpr.fpr)
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tpr.fpr |
Output of |
Numeric scalar.
Toby Dylan Hocking
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 | library(WeightedROC)
## Compute the AUC for this weighted data set.
y <- c(0, 0, 1, 1, 1)
w <- c(1, 1, 1, 4, 5)
y.hat <- c(1, 2, 3, 1, 1)
tp.fp <- WeightedROC(y.hat, y, w)
(wauc <- WeightedAUC(tp.fp))
## For the un-weighted ROCR example data set, verify that our AUC is
## the same as that of ROCR/pROC.
if(require(microbenchmark) && require(ROCR) && require(pROC)){
data(ROCR.simple, envir=environment())
microbenchmark(WeightedROC={
tp.fp <- with(ROCR.simple, WeightedROC(predictions, labels))
wroc <- WeightedAUC(tp.fp)
}, ROCR={
pred <- with(ROCR.simple, prediction(predictions, labels))
rocr <- performance(pred, "auc")@y.values[[1]]
}, pROC={
proc <- pROC::auc(labels ~ predictions, ROCR.simple, algorithm=2)
}, times=10)
rbind(WeightedROC=wroc, ROCR=rocr, pROC=proc) #same
}
## For the un-weighted pROC example data set, verify that our AUC is
## the same as that of ROCR/pROC.
data(aSAH, envir=environment())
table(aSAH$s100b)
if(require(microbenchmark)){
microbenchmark(WeightedROC={
tp.fp <- with(aSAH, WeightedROC(s100b, outcome))
wroc <- WeightedAUC(tp.fp)
}, ROCR={
pred <- with(aSAH, prediction(s100b, outcome))
rocr <- performance(pred, "auc")@y.values[[1]]
}, pROC={
proc <- pROC::auc(outcome ~ s100b, aSAH, algorithm=2)
}, times=10)
rbind(WeightedROC=wroc, ROCR=rocr, pROC=proc)
}
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