The Mann-Whitney test is often described as comparing the median of the two groups. Mann-Whitney tests reports 95% CI of difference between medians.Prism now reports the ratio of median survival times, and its confidence interval, both ways so you can choose which to report. If people in group A have a median survival time three times people in group B, then people in group B have one third the median survival of people in group A.Prism now reports the hazard ratio, and its confidence interval, both ways so you can report the one that makes most sense in your clinical context. If people in group A die at twice the rate of people in group B (HR=2.0), then people in group B die at half the rate of people in group A (HR=0.5).Prism now computes the hazard ratio (HR) by two methods: The logrank method and the Mantel-Haenszel method.In this case, multiple comparisons are also computed so as to not assume sphericity. The Greenhouse-Geisser correction allows repeated measures one-way ANOVA to work, even when the assumption of sphericity is violated because the repeated measurements are made in too short a time interval, so that random factors that cause a particular value to be high (or low) don't wash away or dissipate before the next measurement.Prism 6 now allows up to 256 subcolumns, so can perform repeated measures two-way ANVOA with up to 256 subjects per treatment. Prism 6 can handle repeated measures in both factors. Prism 5 could only compute two-way ANOVA with repeated measures in one of the factors. Two-way ANOVA with repeated measures in both factors.
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