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I get errors when running rake test_units: test_destroy(LocationTest): ActiveRecord::StatementInvalid: Mysql::Error: #23000Cannot delete or update a pa rent row: a foreign key constraint fails (`overblijf_tst/groups`, CONSTRAINT `fk _groups_locations` FOREIGN KEY (`location_id`) REFERENCES `locations` (`id`)): D ELETE FROM locations Any pointers?? -- Posted vi...

Hello! I need to use Kruskal-Wallis test and post-hoc test (Dunn's test) for my data. But when I searched around, I only found this function: kruskal.test. But nothing for Dunn's test. So I started to write one myself. But I do not know how to count ties in the data frame. I can use for loops but it seems long and unnecessary since the rank function actually knows the ties. So