understanding I() in lmer formula
If you don't get a prompt reply here, you might do better posting this on the r-sig-mixed-models list (for obvious reasons). Cheers, Bert Bert Gunter "The trouble with having an open mind is that people keep coming along and sticking things into it." -- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )
On Tue, Jun 13, 2017 at 11:25 AM, Don Cohen <don-r-help at isis.cs3-inc.com> wrote:
Is there a difference between I(x*y) and I(y*x) ? I have a call to lmer that results in this complaint: Error in is.alpha2.subordinate * ~z.min.co.res : non-numeric argument to binary operator when I change this line: I(is.alpha2.subordinate*z.min.co.res)+ to this: I(z.min.co.res*is.alpha2.subordinate)+ the complaint goes away. I'd like to understand why.
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