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 pi?
livelli
how can I solve this problem? I thank u for your patience and attention.
---------- Initial Header -----------
>From : "casot at libero.it" casot at libero.it
To : "casot" casot at libero.it
Cc : "r-help" r-help at 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
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