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Take a formula and return a vector of the variables on the right hand side

Usage

rhs.vars(formla)

Arguments

formla

a formula

Value

vector of variable names

Examples

ff <- yvar ~ x1 + x2
rhs.vars(ff)
#> [1] "x1" "x2"

ff <- y ~ x1 + I(x1^2)
rhs.vars(ff)
#> [1] "x1"      "I(x1^2)"