[R] Error message from allEffects(model) / effect(model)" ‘range’ not meaningful for factors"

[Michael Dewey]

You rm is of class summary.lm
Is that what allEffects is expecting?

On 19/08/2015 01:49, Robert Zimbardo wrote:
> Hi
>
> I cannot figure out why the effects package throws me error messages
> with the following simple code:
>
>
> rm(list=ls(all=TRUE)); set.seed(1); library(effects)
> # set up data
> x <- factor(rep(letters[1:3], each=100))
> y <- c(rnorm(100, 3, 3), rnorm(100, 4, 3), rnorm(100, 5, 3))
>
>
> # fit linear model
> m <- summary(lm(y~x)) # no problem
>
> # now the problem
> plot(allEffects(m))
> # Error in Summary.factor(c(1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L,  :
> #   ‘range’ not meaningful for factors
> plot(effect("x", m))
> # Error in Summary.factor(c(1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L,  :
> #   ‘range’ not meaningful for factors
>
>
> Any ideas? It's go to be something superobvious, but I don't get it. Thanks,
> RZ
>
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-- 
Michael
http://www.dewey.myzen.co.uk/home.html