conf.fbroc.roc: Generates confidence intervals for the TPR for a range of...

In fbroc: Fast Algorithms to Bootstrap Receiver Operating Characteristics Curves

Description

Calculates confidence intervals for the TPR at different FPR values or vice versa. The stepsize at which the TPR or FPR is calculated can be set as needed.

Usage

## S3 method for class 'fbroc.roc'
conf(roc, conf.level = 0.95, conf.for = "tpr",
  steps = 250, ...)

Arguments

roc	Object of class fbroc.roc.
conf.level	Confidence level to be used for the confidence intervals. Defaults to 0.95.
conf.for	Use "tpr" to get confidence regions for the TPR at specific FPRs. Use "fpr" instead for confidence regions for the FPR at specific TPRs.
steps	Number of discrete steps at which the requested rate and the confidence region is calculated. Defaults to 250.
...	Further arguments, that are not used at this time.

Value

A data.frame containing either discrete TPR steps and estimates and confidence bounds for FPR or vice versa, depending upon conf.for.

See Also

boot.roc

Examples

data(roc.examples)
example <- boot.roc(roc.examples$Cont.Pred, roc.examples$True.Class,
                    n.boot = 100)
conf(example, conf.for = "tpr", steps = 10) # get confidence regions for TPR at FPR
conf(example, conf.for = "fpr", steps = 10) # get confidence regions for FPR at TPR

Example output

Loading required package: ggplot2
   FPR    TPR Lower.TPR Upper.TPR
1  1.0 1.0000 1.0000000 1.0000000
2  0.9 1.0000 1.0000000 1.0000000
3  0.8 1.0000 1.0000000 1.0000000
4  0.7 1.0000 1.0000000 1.0000000
5  0.6 1.0000 0.9875000 1.0000000
6  0.5 0.9875 0.9750000 1.0000000
7  0.4 0.9875 0.9059375 1.0000000
8  0.3 0.9375 0.8243750 1.0000000
9  0.2 0.8750 0.7487500 0.9625000
10 0.1 0.7750 0.5559375 0.9190625
11 0.0 0.4000 0.3184375 0.6065625
   TPR    FPR Lower.FPR Upper.FPR
1  1.0 0.5125 0.2934375 0.6190625
2  0.9 0.2625 0.1184375 0.3500000
3  0.8 0.1250 0.0434375 0.1940625
4  0.7 0.0750 0.0125000 0.1375000
5  0.6 0.0500 0.0125000 0.1125000
6  0.5 0.0250 0.0000000 0.0750000
7  0.4 0.0000 0.0000000 0.0565625
8  0.3 0.0000 0.0000000 0.0000000
9  0.2 0.0000 0.0000000 0.0000000
10 0.1 0.0000 0.0000000 0.0000000
11 0.0 0.0000 0.0000000 0.0000000

fbroc documentation built on May 2, 2019, 11:39 a.m.