[R] nested random factor using lme produces errors

Ben Bolker bbolker at gmail.com
Mon Feb 18 17:23:53 CET 2013

melswed <amelie.truchy <at> slu.se> writes:

> I understand. I want to specify that drug is only a fixed factor and family
> should be the only random factor. So maybe, my R code is wrong.... If I
> specify random=~1|drug/family it is only because I wanted to specify that
> family is nested within drug.

 Then you want 


drug/family expands to drug + drug:family, so it includes both an effect of
drug and a family-within-drug term.

See http://glmm.wikidot.com/faq#modelspec , which I've just updated.

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