coxSpecial {riskRegression}

Special characters in Cox model

Description

Return the special character(s) of the Cox model, e.g. used to indicate the strata variables.

Usage

coxSpecial(object)

## S3 method for class 'coxph'
coxSpecial(object)

## S3 method for class 'cph'
coxSpecial(object)

## S3 method for class 'phreg'
coxSpecial(object)

Arguments

object

The fitted Cox regression model object either obtained with coxph (survival package), cph (rms package), or phreg (mets package).

Details

Must return a list with at least one element strata indicating the character in the formula marking the variable(s) defining the strata.

Author(s)

Brice Ozenne [e-mail]