How to reliably get dependent variable name from formula object?

Question

Let\'s say I have the following formula:

myformula<-formula(\"depVar ~ Var1 + Var2\")

How to reliably get dependent variable name from formu

Answer 1

I found an useful package 'formula.tools' which is suitable for your task.

code Example:

f <- as.formula(a1 + a2~a3 + a4)

lhs.vars(f) #get dependent variables

[1] "a1" "a2"

rhs.vars(f) #get independent variables

[1] "a3" "a4"