estC {compareC} R Documentation

## Estimation of a single overall C index

### Description

This is a function used to estimate a single overall C index

### Usage

	estC(timeX, statusX, scoreY)


### Arguments

 timeX The vector of actual survival time X, one survival time for each observation statusX The matching vector of event indicator for time X, 1 if occured and 0 otherwise scoreY The vector of the measured biomarker Y, one for each of the same observations, based on which the C index is to be estimated

### Value

The estimated C index

### Author(s)

Le Kang, Weijie Chen

### References

Harrell FE, Califf RM, Pryor DB, Lee KL, and Rosati RA. (1982) Evaluating the yield of medical tests. The Journal of the American Medical Association, 247(18), 2543–2546

Pencina MJ and D'Agostino RB. (2004) Overall C as a measure of discrimination in survival analysis: model specific population value and confidence interval estimation. Statistics in Medicine, 23(13), 2109–2123

Kang L, Chen W, Petrick NA, and Gallas BD. (2014) Comparing two correlated C indices with right-censored survival outcome: a one-shot nonparametric approach. Statistics in Medicine, 34(4), 685–703, doi: 10.1002/sim.6370

vardiffC,compareC
demo(testC)