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2011 Feb 05
1
very basic HLM question
...g random effects Anova. I am using a database of students, clustered
on schools (there is not the same number of students by school).
According to the ICC1 command, the interclass correlation is .44
> ICC1(anova1)
[1] 0.4414491
However, I cannot get the same ICC from the lmer output:
> anova2 <- lmer(math ~ 1 + (1|schoolid), data=nels88)
> summary(anova2 <- lmer(math ~ 1 + (1|schoolid), data=nels88))
Linear mixed model fit by REML
Formula: math ~ 1 + (1 | schoolid)
Data: nels88
AIC BIC logLik deviance REMLdev
1878 1888 -935.8 1875 1872
Random effects:
Group...
2011 Oct 09
3
ANOVA from imported data has only 1 degree of freedom
...2 4 21
10 Coleoptera 2 5 11
11 Coleoptera 3 1 19
12 Coleoptera 3 2 16
13 Coleoptera 3 3 9
14 Coleoptera 3 4 32
15 Coleoptera 3 5 29
/The command I am using is this:/
anova2<-aov(Abundance~Transect,data=beetle)
/The results come out like this:/
Df Sum Sq Mean Sq F value Pr(>F)
Transect 1 250.00 250.000 7.2394 0.01852 *
Residuals 13 448.93 34.533
---
Signif. codes: 0 ?***? 0.001 ?**? 0.01 ?*? 0.05 ?.? 0.1 ? ? 1
Cheers,
Sam
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Vi...