[R] bartlett.test()

[S Ellison]

>>> Birgitle <birgit.lemcke at systbot.uzh.ch> 05/06/2008 10:33:20 >>>
>I think you should specify your grouping factor:
Yes, the message says the grouping factor is missing. 

But xx should not be a matrix. 

Your x data should be in a (1-dimensional) vector of length 276, and so should your grouping factor.  

Toy example:
x<-rnorm(9)
g<-factor(paste("Group",rep(1:3, each=3)))
bartlett.test(x,g)


hanen wrote:
> 
> i'm trying to test the homogeneity of variance of 92 samples each one
> contains 3 observations.
> to use bartlett.test function i have created a (3,92) matrix (named xx):
>>bartlett.test(xx)
> 
> this message appears:
> 
>>Erreur dans bartlett.test.default(xx) : 
>   l'argument "g" est manquant, avec aucune valeur par défaut
> 
> when i checked the help i have understood that in g i should specified my
> différent samples in the case that xx is not a list.So i have tried to
> convert mode's xx in the list by:
> 
>>bartlett.test(list(xx))
> 
> this message appears:
> 
>>Erreur dans bartlett.test.default(list(xx)) : 
>   'x' must be a list with at least 2 elements
> 
> what should i do?
> and if the solution is to use a data frame how can i add the 92
> columns'names to such data.frame? because the use of the function
> names(data.frame)<-list("...  and entering 92 words it seems painfull.
> 
>  is there any one who can help me now?
> 
> please answer me as soon as possible. 
> 
> 


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