[R-sig-ME] Nested fixed factors in glmer: Error in mer_finalize(ans) : Downdated X'X is not positive definite, 1.

Henrik Singmann henrik.singmann at psychologie.uni-freiburg.de
Thu Feb 28 22:06:55 CET 2013

The gem below will be in the next version of the fortunes package (already in the R-Forge version, thanks to Achim Zeileis).


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-Universität Freiburg, Germany

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