Friedman test

• Assumptions to check :

  • the data are in rank-order format (or have been transformed from to rank-order from interval/ratio)

  • the sample has been randomly selected from the population it represents

  • samples do not need to be normally distributed

• Report design (in Method section)

  • statictical package or program used in the analysis (RRID)

• Statistics (in Results section)

  • chi-square statistics

  • degrees of freedom,

  • exact p-values

  • post hoc test