Dear R-sig-mixed-models Group,

I am new in R and I would confirm my understanding of lmer function in lme4 via the example below: 

lmer(Y~(1|X)+(1|X:Y)+(1|Y:Z))

X is random
The interaction between X and Y is random
Z nested into Y is random

If so, should I unsderstand that interaction and nesting are similarly specified.

Grateful if someone could advise. Thank you!

Gaston
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