cindex: Calculate Harrell's c-index

In dynpred: Companion Package to "Dynamic Prediction in Clinical Survival Analysis"

Description

This function calculates Harrell's c-index.

Usage

cindex(formula, data)

Arguments

formula	Formula for prediction model to be used as in coxph
data	Data set in which to interpret the formula

Value

A list with elements

concordant	The number of concordant pairs
total	The total number of pairs that can be evaluated
cindex	Harrell's c-index

Author(s)

Hein Putter [e-mail]

References

Harrell FE, Lee KL & Mark DB (1996), Multivariable prognostic models: issues in developing models, evaluating assumptions and adequacy, and measuring and reducing errors, Statistics in Medicine 15, 361-387.

van Houwelingen HC, Putter H (2012). Dynamic Prediction in Clinical Survival Analysis. Chapman & Hall.

Examples

data(ova)
cindex(Surv(tyears, d) ~ Karn + Broders + FIGO + Ascites + Diam, data = ova)

Example output

Loading required package: survival
$concordant
[1] 39298.5

$total
[1] 59026

$cindex
[1] 0.6657829

dynpred documentation built on May 2, 2019, 5:07 a.m.