R modelr formulas 创建公式列表

formulas(.response, ...)

formulae(.response, ...)

# Provide named arguments to create a named list of formulas:
models <- formulas(~lhs,
  additive = ~var1 + var2,
  interaction = ~var1 * var2
)
models$additive
#> lhs ~ var1 + var2
#> <environment: 0x5639f9576680>

# The formulas are created sequentially, so that you can refer to
# previously created formulas:
formulas(~lhs,
  linear = ~var1 + var2,
  hierarchical = add_predictors(linear, ~(1 | group))
)
#> $linear
#> lhs ~ var1 + var2
#> <environment: 0x5639f9576680>
#> 
#> $hierarchical
#> lhs ~ var1 + var2 + (1 | group)
#> <environment: 0x5639f9576680>
#>