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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