[R] Kruskal Walllis test

[imrib]

Hi all
My data table (g) contains a continues data column (plant.height) and other
columns (columns 8 to 57), 

each with number of levels of different factors.  ANOVA test was done and
the p-values were extracted 

as follos:

a <- function(x) anova(lm(plant.height ~ x))$"Pr(>F)"[1]

r<- apply(g[,8:57],2,a)

If I try to do a Kruskal-Wallis test :

kw <- function(x) kruskal.test(plant.height ~ x)$"p.value"

r.kw <- apply(g[,8:57],2,kw)

I get the following error message:

Error in kruskal.test.default(c(0.16, 0, 0.007, 0.078, 0, 0.08, 0.19,  :

all group levels must be finite

Why do I get this error ? (the values in c() are the plant.height values)

Thanks


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