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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