OptionalalternativeAlternative hypothesis (unambiguous abbreviations accepted). Default "two.sided". As in lawstat, "greater"
means that x tends to be larger than y (the relative effect is below 1/2) and "less" the opposite.
OptionalconfConfidence level of the interval for the relative effect (lawstat's 1 - alpha). Default 0.95.
Options for brunnerMunzelTest.