bda (version 10.1.9)

roc: Receiver operating characteristic (ROC)

Description

To compute and draw a ROC curve.

Usage

roc(y, x, z=NULL, event="less")

Arguments

y

Logical. Actual status: event or not.

x

Numberical vector based on which the diagnosis is performed.

z

Logical. A covariate for diagnosis in addition to 'x'.

event

Default: less. To classify a case to be an event if x is less than a cutoff. Otherwise, a case will be classified as an event of if x is greater than a cutoff.

Value

The TPR or sensitivity, and FPR or (1-specificity) will be returned together with the cutoffs.

The area under the ROC curve can be computed using summary function.

The ROC curve can be ploted using plot function.

Examples

# NOT RUN {
x <- rnorm(100)
y <- rnorm(100)<0
out = roc(y,x)

# }

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