[R] Error message in lmer

[lorenz.gygax at art.admin.ch]

I do not think anyone has answered this.

> I'm trying to run a simple one-way ANCOVA with the lmer 
> function in R  package lme4, but have encountered some
> conceptual problem. The data file MyData.txt is like this:
> 
> Group Subj Cov Resp
> A    1   3.90   4.05
> A	 2   4.05	4.25
> A	 3   4.25	3.60
> A	 4   3.60	4.20
> A	 5   4.20	4.05
> A	 6   4.05	3.85
> B	 7   3.85	4.15
> B	 8   4.15	4.60
> B	 9   4.60	4.15
> B	 10  4.15	4.40
> B	 11  4.40	3.35
> B	 12  3.35	3.80
> B	 13  3.80   3.90
> 
> Since I would like to treat subject (Subj) as a random 
> factor, my one- way ANCOVA (with covariate, Cov) is:

This is a conceptual problem, indeed. To be able to estimate a subject effect, you need to have repeated measurements (several lines) per observed subject ...

Cheers, Lorenz