*! version 1.0 Chao Wang 21/07/2017
help mc

Title

mc -- Calculate the matched concordance index

Syntax

mc depvar indepvars [if] [in] [, options]

by is allowed

Description

mc calculates the matched concordance index (mC) proposed by Brentnall et al. [1].

Options

group(varname) specifies the grouping variable. breps(integar)
specifies the number of bootstrap replications for calculating confidence intervals;
the default is 1000. nobootstrap requests bootstrap not to be performed.

Stored Results

The mC is stored as a r-class object. Confidence intervals from bootstrap
are saved as e-class objects.

Examples

. webuse lowbirth2, clear

. clogit low lwt smoke ptd ht ui i.race, group(pairid)

. predict phat

. mc low phat, group(pairid)

. roctab low phat

Acknowledgement

This command is based on ARB's R code.

Reference

[1] A. R. Brentnall, J. Cuzick, J. Field, and S. W. Duffy, "A concordance index for matched case-control studies with applications in cancer risk," Statistics in Medicine, vol. 34, pp. 396-405, Feb 10 2015.

Author

Chao Wang, BEng MSc DIC PhD, Statistician, Queen Mary University of London,
excelwang@gmail.com.