Hi!
 
I am an R beginer, so perhaps this is a quite simple question...
After using the lmer command (under the lme4 package) for fitting a mixed model, it was impossible to use de command plot(model) for checking model adequacy. R returns this message: "Error in as.double(y) : cannot type '%s' coerce to vector".
 
Could anyone be so kind to tell me what to do?
 
How can I continue to use lme library instead of lmer? R does not recognize lme anymore.
Thanks in advance!
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