[R] sapply?

[casot at libero.it]

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.



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>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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