Kruskal-Wallis test with details on pairwise comparisons

Question

The standard stats::kruskal.test module allows to calculate the kruskal-wallis test on a dataset:

>>> data(diamonds)
>>> kruskal.test(price         


        

Answer 1

You can use PMCMR package. There is more information about it.

Spelling_Grades <- c(90,87,89,90,75,88,97,99,78,85,72,76,77,79,70)
Methods <- c("A","A","A","A","B","B","B","B","B","B","C","C","C","C","C")
kruskalmc(Spelling_Grades~Methods)

#This method doesn't accept characters that's why I've changed the methods to integer
Methods <- c(1,1,1,1,2,2,2,2,2,2,3,3,3,3,3)
posthoc.kruskal.nemenyi.test(Spelling_Grades~Methods) 

The two methods above give same results.