Erik -
Perhaps the "response" attribute of the terms() function?
formula1 = formula(y ~ x + z)
formula2 = formula(~x + z)
attr(terms(formula1),'response')
[1] 1
attr(terms(formula2),'response')
[1] 0
Although there may be more direct ways.
- Phil Spector
Statistical Computing Facility
Department of Statistics
UC Berkeley
spec...@stat.berkeley.edu
On Mon, 13 Dec 2010, Erik Iverson wrote:
Hello,
Does anyone know of a function that will determine whether
or not a formula object has a left hand side?
I.e., can differentiate between
y ~ x + z
and
~ x + z
Perhaps I'm overlooking the obvious...
Thanks!
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