Dear r-helpers,
I want to test groups of samples for significant differences.
Question: Does Group1 differ significantly from group2.
This is a question to be answered by mann-whitney-u-test.
I know that I can use wilcox.test with 2 samples.
My problem: How can r perform the test automatically if there are more than 2
groups in my data frame.
Test group1 vs. 2, 1 vs. 3, 1 vs. 4, etc.
This is my skript:
Deckung <- read.table("Gesamtdeckung.csv", sep=";", header=TRUE, dec=",",
row.names=1)
x <- Deckung$Gesamtdeckung
y <- Deckung$Klasse
#U-Test
wilcox.test(x ~ y, paired = FALSE, subset = y %in% c("1", "2"))
wilcox.test(x ~ y, paired = FALSE, subset = y %in% c("1", "3"))
wilcox.test(x ~ y, paired = FALSE, subset = y %in% c("2", "3"))
Any help would be greatly appreciated!
Thanks
Kim
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