get_covariate_names: Get covariate names
Description
Get covariate names
Usage
get_covariate_names(formula)
Value
Covariate names character vector
Arguments
- formula
Linear regression formula object. Prognostic factors (PF) are main effects and effect modifiers (EM) are
interactions with the treatment variable, e.g., y ~ X1 + trt + trt:X2. For covariates as both PF and EM use * syntax.