[R] Finding out collinearity in regression

[Kevin Wang]

Hi,

Young Cho wrote:

> fit <- aov( Y ~ . , data = dat)
> Error in "contrasts<-"(`*tmp*`, value =
> "contr.treatment") :
>         contrasts can be applied only to factors with
> 2 or more levels
> 
> I think there is a dependency in explanatory
> variables. So, I wanted to use alias to find out a
> dependency in design matrix but I can't because I
> cannot create "fit" in the first place.

The error message actually looks like you have got (at least) a variable 
that only has 1 level, e.g. a factor with only one level.

Cheers,

Kev

-- 
Ko-Kang Kevin Wang
PhD Student
Centre for Bioinformation Science
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Mathematical Sciences Institute (MSI)
Australian National University
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