Kruskal-Wallis: fit_q ~ arch Kruskal-Wallis rank sum test data: fit_q by arch Kruskal-Wallis chi-squared = NaN, df = 2, p-value = NA Kruskal-Wallis: win_div ~ arch Kruskal-Wallis rank sum test data: win_div by arch Kruskal-Wallis chi-squared = NaN, df = 2, p-value = NA Kruskal-Wallis: fit_q ~ seed Kruskal-Wallis rank sum test data: fit_q by seed Kruskal-Wallis chi-squared = NaN, df = 2, p-value = NA Kruskal-Wallis: win_div ~ seed Kruskal-Wallis rank sum test data: win_div by seed Kruskal-Wallis chi-squared = NaN, df = 2, p-value = NA