I *believe* that the order is determined by the number of levels of the
grouping variables (decreasing? increasing? don't remember), in order to
optimize the internal structure of the random effects design matrices, i.e.
to minimize the amount of fill-in.  Don't remember the details at the
moment, it will be mentioned somewhere in Doug Bates's various
presentations on lme4/mixed models. View shared post<https://www.google.co.uk/#>


On Wed, Feb 19, 2014 at 7:30 PM, Asaf Weinstein
<asafw.at.wharton@gmail.com>wrote:

> Hi,
>
> I am running an (unbalanced) two-way random effects model.
> I was not able to figure out myself how lmer decides which of the variance
> components (of the two random effects) is reported first in the output (in
> other words, how the order in getME(fm, 'theta') is determined?).
>
> Thanks so much,
> Asaf
>
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