Hi folks, sorry for this beginner question but what means a p-value = NA on
a menn-whitney test?

v1 <- c(0.022, 0.022, 0.022, 0.022, 0.022, 0.022)
v2 <- c(0.022, 0.022, 0.022, 0.022, 0.022)
wilcox.test(v1, v2, PAIRED=FALSE)

W = 15, p-value = NA

I know that there's no statistical difference between v1 and v2, so why my
p-value is not ONE ??

Can I consider p-value= NA  as ONE ??
what i do when get this type of value on wilcox.test ???


PS: sorry for my bad english.

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