The rank s um tes t for outliers advanced by W. J. Youde n provid es a method for de tec ting if the measure me nt di stribution of anyone of a group of obj ec ts has a mean signifi ca ntly different from the res\. This pape r di scusses a more ge ne ral appli cation of the rank sum procedure whi c h permits a s imilar test on other parame ters, s uch as th e va rian ce, with the sa me tables. Tables of th e c ritical values of the extreme rank sum and the co rres pon ding signifi ca nce leve

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... for one-s ide d tes ts are given in thi s paper to s uppl e me nt s imilar tabl es for two-sid e d tes ts a lready publi shed.