Construct a namespace-safe survival formula

This convenience helper lets users name MAE metadata columns without first attaching or calling the survival package. More complex time-dependent or stratified formulas can still be supplied directly to surv_km() and surv_cox().

Usage

surv_formula(time, event, predictors = NULL)

Arguments

time, event

Metadata column names containing follow-up time and event.

predictors

Optional right-hand-side variable names. These must be sample-metadata columns for surv_km(). For surv_cox(), expression features are also available when the same names are supplied through its features argument.

Value

A formula with a survival::Surv() response.