R help - Apr 2008 - Strange message when plot function used..

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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Cristian Carranza wrote:
> 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".
Because lme4 does not ship a plot method for th lmer class and 
plot.default cannot handle the object ...

> Could anyone be so kind to tell me what to do?
Think about how your plot should look like and implement it yourself.

> How can I continue to use lme library 
> instead of lmer? R does not recognize lme anymore.
> Thanks in advance!
What is "lme library"? If you mean the function lme() from package 
"nlme", you have to load "nlme" rather than
"lme4".

Uwe Ligges




 
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