formulae: Decompose formula objects

In hce: Design and Analysis of Hierarchical Composite Endpoints

Decompose formula objects

Description

Decompose formula objects to treatment, response, covariate, and grouping variables using standardized names TRTP, AVAL, COVAR, and GROUP respectively.

Usage

as_formulae(x, ...)

## S3 method for class 'formula'
as_formulae(x, ...)

Arguments

x	a formula object.
...	further arguments passed to or from other methods.

Value

A list with standardised components named AVAL, TRTP, COVAR, and GROUP where present, containing the original variable names extracted from x, plus a reconstructed formula.

See Also

summaryWO.formula(), stratWO.formula() for use.

Examples

# Example 1: All variables present
as_formulae(x = visit4 ~ treatment + age | sex)
# Example 2: Extra covariates, no grouping variable will drop the extra variable
as_formulae(x = visit4 ~ treatment + age + sex)
# Example 3: When more than two grouping variables, the last one will be used.
 as_formulae(x = visit4 ~ treatment + age | sex |site)

hce documentation built on June 27, 2026, 1:06 a.m.