R: Compute the concordance

concordancefit {survival} | R Documentation

## Compute the concordance

### Description

This is the working routine behind the `concordance` function. It is not meant to be called by users, but is available for other packages to use. Input arguments, for instance, are assumed to all be the correct length and type, and missing values are not allowed: the calling routine is responsible for these things.

### Usage

    concordancefit(y, x, strata, weights, ymin = NULL, ymax = NULL,
     timewt = c("n", "S", "S/G", "n/G", "n/G2", "I"), cluster, influence =0,
     ranks = FALSE, reverse = FALSE, timefix = TRUE, keepstrata=10)

### Arguments

`y` | the response. It can be numeric, factor, or a Surv object
`x` | the predictor, a numeric vector
`strata` | optional numeric vector that stratifies the data
`weights` | options vector of case weights
`ymin, ymax` | restrict the comparison to response values in this range
`timewt` | the time weighting to be used
`cluster, influence,ranks, reverse, timefix` | see the help for the `concordance` function
`keepstrata` | either TRUE, FALSE, or an integer value. Computations are always done within stratum, then added. If the total number of strata greater than `keepstrata`, or `keepstrata=FALSE`, those subtotals are not kept in the output.

### Value

a list containing the results

### Author(s)

Terry Therneau

### See Also

`concordance`

[Package survival version 3.2-7 Index]