I *think* the syntax for the model Federico wants is this:

lmer(y~selection*males+ (selection|month) + (males|month))

My lme syntax is a bit rusty, so I'm not confident how to recode with nested
random effects, as in P&B p24.


Two quick points:
1. I think Federico has caused some confusion on account of the way he used
the term 'crossing'2. Whilst interesting reading, some of the content of
this thread does not conform to the list's rules and regs.

Best wishes, Nick

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