pchc (version 0.4)

ROC and AUC: ROC and AUC

Description

Receiver operating curve and area under the curve.

Usage

auc(group, preds, roc = FALSE, cutoffs = NULL)

Arguments

group

A numerical vector with the predicted values of each group as 0 and 1.

preds

The predicted values of each group.

roc

If you want the ROC to appear set it to TRUE.

cutoffs

If you provide a vector with decreasing numbers from 1 to 0 that will be used for the ROC, otherwise, the values from 1 to 0 with a step equal to -0.01 will be used.

Value

A list including:

cutoffs

The cutoff values.

sensitivity

The sensitivity values for each cutoff value.

specificity

The specificity value for each cutoff value.

youden

The pair of of 1- specificity and sensitivity where the Youden's J appears on the graph and the Youden index which is defined as the maximum value of sensitivity - specificity + 1.

auc

The area under the curve, plus a circle with the point where Youden's J is located. If "roc" is set to FALSE, this is the only item in the list to be returned.

Details

The ara under the curve is returned. The user has the option of getting the receiver operating curve as well.

See Also

bn.skel.utils, conf.edge.lower, mmhc.skel

Examples

# NOT RUN {
g <- rbinom(150, 1, 0.6)
f <- rnorm(150)
pchc::auc(g, f, roc = FALSE)
# }