[R] Strange message when plot function used..

From: Cristian Carranza <cristiancarranza_1_at_hotmail.com>
Date: Sun, 06 Apr 2008 18:48:45 +0300


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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