preceded by ANOVA post-hoc analysis A post-hoc analysis is a statistical test carried out following an analysis of variance which ruled out the null hypothesis of absence of difference between group which allows identifying which groups differ. Alejandra Gonzalez-Beltran Orlaith Burke Philippe Rocca-Serra a posteriori test adapted from wikipedia: http://en.wikipedia.org/wiki/Post-hoc_analysis last accessed: 2013-11-15 between group comparison statistical test ready for release