Hi,
You need to add parentheses around your return argument. (Please, note that
your example is not successfully because of data problem).
ranksum <- function(a){
g1 <- c(1, 2, 3)
g2 <- c(4, 5, 6, 7, 8, 9, 10, 11, 12)
c <- wilcox.test(a[g1], a[g2])
return(c$p.value)
}
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