Nested fixed factors in glmer: Error in mer_finalize(ans) : Downdated X'X is not positive definite, 1.
The gem below will be in the next version of the fortunes package (already in the R-Forge version, thanks to Achim Zeileis). Cheers, Henrik Am 28.02.2013 16:37, schrieb Douglas Bates:
I think that the formula language does allow expressions with '/' to represent nested factors but I can't check right now as there is a fire in the building where my office is located. I prefer to simply write nested factors as factor1 + factor1:factor2
Dipl. Psych. Henrik Singmann PhD Student Albert-Ludwigs-Universit?t Freiburg, Germany http://www.psychologie.uni-freiburg.de/Members/singmann