BMC Bioinformatics has published a paper by colleagues of mine, about calculating exact p-values for pairwise comparison of Friedman rank sums. The paper provides fast and easy-to-use R code, making it an interesting read for anyone conducting the Friedman test. Fancy full text is available at http://rdcu.be/oOf9

Exact p-values for pairwise comparison of Friedman rank sums, with application to comparing classifiers, Eisinga, Heskes, Pelzer & Te Grotenhuis, BMC Bioinformatics, 2017, 18:68. http://dx.doi.org/10.1186/s12859-017-1486-2