Hi all,
I am a bit mystified by this error message that I get when I try to apply
lmer() to a simple dataset with one between factor (age) and one within
factor (item): "$ operator is invalid for atomic vectors"
I'll just provide the code, because I don't see where the problem is:
library(lme4)
options(contrasts=c("contr.helmert","contr.poly"))
data =
read.csv("C:/Users/Angela/Desktop/Summer_at_CDS/aging_JDM_Martine/datasets/lamda.data_07.27.09.csv",
header=TRUE)
attach(data)
new<-data.frame(lamda, age.o_1, Item.l2_2,Subject)
new
Subject <- factor(Subject)
Age <- factor(age.o_1,levels=c("0","1"),labels=c("young","old"))
Item <- factor(Item.l2_2,levels=c("1","2"),labels=c("lamda1","lamda2"))
new2<-data.frame(lamda, Subject, Age, Item)
new2
new3 <- na.omit(new2)
new3
new4=as.data.frame(new3)
> (lmer.lamda <- lmer(lamda ~ Age*Item + ( 1 | Subject), lamda, data=new4))
Error in family$family : $ operator is invalid for atomic vectors
Here are the first 25 values of the dataframe lmer() should operate on:
lamda Subject Age Item
1 1.6000000 1 old lamda1
2 1.0434783 2 old lamda1
3 0.9600000 3 old lamda1
4 3.4285714 4 old lamda1
5 1.1428571 5 old lamda1
6 2.1818182 6 old lamda1
7 0.9600000 7 old lamda1
8 1.8461538 8 old lamda1
9 2.1818182 9 old lamda1
10 1.8461538 10 old lamda1
11 1.8461538 11 old lamda1
12 1.8461538 12 old lamda1
13 2.6666667 13 old lamda1
14 2.6666667 14 old lamda1
15 1.8461538 15 old lamda1
16 1.0434783 16 old lamda1
17 1.8461538 17 old lamda1
18 2.6666667 18 old lamda1
19 2.6666667 19 old lamda1
20 8.0000000 20 old lamda1
21 1.8461538 21 old lamda1
22 8.0000000 22 old lamda1
23 1.8461538 23 old lamda1
24 2.6666667 24 old lamda1
25 2.1818182 25 old lamda1
Any help would be much appreciated this one. I am in the dark and tried
pretty much everything...
Many thanks,
Angela
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