Simple question In what, if any, circumstances would rank based tests (e.g. Mann-Whitney, Kruskal-Wallis, Friedman) be prefered to ordinal analyses based on normal or logit transforms of cumulative probabilities? Advice with references much appreciated Best Diana Professor Diana Kornbrot email: [log in to unmask] web: http://web.me.com/kornbrot/KornbrotHome.html Work School of Psychology University of Hertfordshire College Lane, Hatfield, Hertfordshire AL10 9AB, UK voice: +44 (0) 170 728 4626 fax: +44 (0) 170 728 5073 Home 19 Elmhurst Avenue London N2 0LT, UK voice: +44 (0) 208 883 3657 mobile: +44 (0) 796 890 2102 fax: +44 (0) 870 706 4997 You may leave the list at any time by sending the command SIGNOFF allstat to [log in to unmask], leaving the subject line blank.