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Random effect variance = zero

Marco Plebani 
Dear list members,

Thank you all for the useful feedback.
For reference, here are two other recent threads closely linked to the one discussed here (i.e. https://stat.ethz.ch/pipermail/r-sig-mixed-models/2014q3/022496.html ):
https://stat.ethz.ch/pipermail/r-sig-mixed-models/2014q3/022359.html (?Same variable as both fixed and random?)
https://stat.ethz.ch/pipermail/r-sig-mixed-models/2014q3/022389.html (?Mixed effect models for a study with no (real)	replication?)
They sort of built up to the issue raised by Aurore.

Cheers,

Marco

-----
Marco Plebani, PhD candidate (Ecology) at the University of Zurich
Institute of Evolutionary Biology and Environmental Studies
http://www.ieu.uzh.ch/staff/phd/plebani.html
http://marcoplebani.com/