Additional file 2: of Understanding the cluster randomised crossover design: a graphical illustration of the components of variation and a sample size tutorial ArnupSarah McKenzieJoanne HemmingKarla PilcherDavid ForbesAndrew 2017 Binary outcomes sample size Stata do file. Stata do file to perform sample size calculations for binary outcomes using formulae presented in the ‘Performing a sample size calculation’ section, for a given set of sample size parameters. (DO 2 kb)