formulae: Formulae from variable combinations
In pezzacolori/boris-r-misc: Boris' miscellanea

Build the formulae (as strings) from variable names

formulae(
  formula,
  dep = NULL,
  vars = NULL,
  nullmodelterm = "1",
  minsize = 1,
  maxsize = NULL
)

`formula`	formula with all the terms (beyond optimal model)
`dep`	name of the dependent variable. If the `formula` is specified, this argument is not considered.
`vars`	character vector with the names of the independent variables (wihtout nullmodel term). If the `formula` is specified, this argument is not considered.
`nullmodelterm`	to specify in case of an always required fixed term (should not be included in the vars)
`minsize`	minimum size of the formula (number of independent variables)
`maxsize`	maximum size of the formula (number of independent variables). NULL means unrestricted.