Dear Prof Bates and fellow mixed modellers,

I would find it helpful to have a brief discussion about how lmer handles
the "weights=" argument. This follows from a threat around three weeks ago
(Crash fitting lmer in lme4_0.999375-4) which is no longer appropriate.

Briefly, I ran some weights mixed models in lmer 0.999375-4 that caused R to
crash. The same models did not cause a crash in 0.999375-5 but the variance
estimates on the random effects were improbably high. I get different
estimates in 0.999375-10, but still > 10^8.

Prof Bates conceded that the handling of weights lmer

The variance estimates

Having run some
I now believe that
the core problem in my dataset is

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