I tried to perform a two way anova on my data, but I got this error
vitignova<-sapply(vitigni.df[,1:length(vitigni)], FUN=function(x)
summary(aov(x~vitigni.df$cultivar*vitigni.df$year))[[1]][1,"Pr(>F)"])
Errore in `contrasts<-`(`*tmp*`, value = "contr.treatment") :
i contrasti si possono applicare solo a variabili factor con 2 o più
livelli
how can I solve this problem? I thank u for your patience and attention.
---------- Initial Header -----------
>From : "[EMAIL PROTECTED]" [EMAIL PROTECTED]
To : "casot" [EMAIL PROTECTED]
Cc : "r-help" r-help@stat.math.ethz.ch
Date : Thu, 2 Aug 2007 08:53:32 +0200
Subject : [R] sapply?
> I have to compare four different grape varieties proteome in two different
> years. I don't know what test would be more suitable for my data. I think
> that an anova two way can be usefull also if someone suggested me to perform
> a manova. In addiction, I can perform each test on a single protein a time,
> but I can't loose my whole life carrying out anova (I have more than 1000
> protein to analyze)!!! I would like to perform the test on every column of
> the dataframe in a single run. How can I do that? I attach an example of some
> protein of my dataset
> >
> >
> > ------------------------------------------------------
> > Leggi GRATIS le tue mail con il telefonino i-mode di Wind
> > http://i-mode.wind.it/
> >
> >
>
>
> ------------------------------------------------------
> Leggi GRATIS le tue mail con il telefonino i-mode di Wind
> http://i-mode.wind.it/
>
>
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