Try to use "kruskalmc" in the package pgirmess
I give one of my results
> kruskal.test(rojos~mes)
Kruskal-Wallis chi-squared = 132.3091, df = 3, p-value < 2.2e-16
> kruskalmc(rojos~mes)
Multiple comparison test after Kruskal-Wallis
p.value: 0.05
Comparisons
obs.dif critical.dif difference
abril-julio 134.52815 56.84018 TRUE
abril-junio 53.42185 58.73584 FALSE
abril-mayo 58.96383 59.73167 FALSE
julio-junio 187.95000 44.40539 TRUE
julio-mayo 75.56432 45.71446 TRUE
junio-mayo 112.38568 48.05106 TRUE
-----
Mario Garrido Escudero
PhD student
Dpto. de Biología Animal, Ecología, Parasitología, Edafología y Qca. Agrícola
Universidad de Salamanca
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