Dear John,
Forgive me for putting my nose out, I hope that I'm not rude, but I am a bit
bewildered by your mail (and by statistical modelling).
I agree that if your model is:
Lawndepression~lawn.roller.weight +(1|lawn.id),
When, in fact, it *should be* (because you simulated the data or you're
Whether or not you need a mixed model, e.g. random versus
fixed slopes, depends on how you intend to use results.
Suppose you have lines of depression vs lawn roller weight
calculated for a number of lawns. If the data will always be
used to make predictions for one of those same lawns, a
fixed sl
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