I am using terms.formula function to substract the variables from a formula
environment.
Concretely, with the attr(*, "term.labels") I get the right side terms
specified in the formula.
However, when introducing the same variable two or more times, this appears
only once.
For example, when typing
>f <- y ~ cholesterol + age + age
>attr(terms(f),"term.labels")
I get
[1] "cholesterol" "age"
and I would like to get
[1] "cholesterol" "age" "age"
Is it possible with terms.formula function to obtain the variables and the
times that they are specified in the formula? Or may I use another function?
Thanks in advance.
Isaac.
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