Cindex {BranchGLM}

Cindex/AUC

Description

Calculates the c-index/AUC.

Usage

Cindex(object, ...)

AUC(object, ...)

## S3 method for class 'numeric'
Cindex(object, y, ...)

## S3 method for class 'BranchGLM'
Cindex(object, ...)

## S3 method for class 'BranchGLMROC'
Cindex(object, ...)

Arguments

object

a BranchGLM object, a BranchGLMROC object, or a numeric vector.

...

further arguments passed to other methods.

y

Observed values, can be a numeric vector of 0s and 1s, a two-level factor vector, or a logical vector.

Details

Uses trapezoidal rule to calculate AUC when given a BranchGLMROC object and uses Mann-Whitney U to calculate it otherwise. The trapezoidal rule method is less accurate, so the two methods may give different results.

Value

A number corresponding to the c-index/AUC.

Examples

Data <- ToothGrowth
Fit <- BranchGLM(supp ~ ., data = Data, family = "binomial", link = "logit")
Cindex(Fit)
AUC(Fit)