9. Methods to Compare Three or More Groups

 

Basic Statistical Tests Training session with Dr Helen Brown, Senior Statistician, at The Roslin Institute, December 2015. ************************************************ These training sessions were given to staff and research students at the Roslin Institute. The material is also used for the Animal Biosciences MSc course taught at the Institute. ************************************************ *Recommended YouTube playback settings for the best viewing experience: 1080p HD ************************************************ Content: Continuous data – comparing 3+ groups Statistical tests available to : --test the hypothesis that all groups are equal Analysis of variance (ANOVA): --suitable for normal data --uses a ‘pooled’ standard deviation (SD) estimate for pairwise comparisons Kruskal-Wallis test --suitable for non-normal data --‘non-parametric’ Log-rank test --Suitable comparing time to event data (eg survival) between several groups