Add a Covariate to a Formula

add_cov_to_formula adds some covariates to a formula; covs should be a list of variable names

Usage

add_cov_to_formula(covs, formula)

Arguments

covs

should be a list of variable names

formula

which formula to add covariates to

Value

formula

Examples

ff <- y ~ x
add_cov_to_formula(list("w", "z"), ff)
#> y ~ x + w + z
#> <environment: 0x6519ebfbb3e0>

ff <- ~x
add_cov_to_formula("z", ff)
#> ~x + z
#> <environment: 0x6519ec0898a8>