[R-sig-ME] glmer warning "fixed-effect model matrix is rank deficient"

[Dan McCloy]

Apologies for the prematurely-sent message containing only session
info (thanks, gmail keyboard shortcuts).  I was going to post about
getting the warning "fixed-effect model matrix is rank deficient, so
dropping 4 columns/coefficients" when running a glmer model, but after
additional testing while creating a MWE, it turned out to be user
error.
-- dan

Daniel McCloy
http://dan.mccloy.info/
Postdoctoral Research Fellow
Institute for Learning and Brain Sciences
University of Washington