Friedman’s test can be selected from Prism’s One-way ANOVA Experimental Design tab. First, enter your data into a Column data table, with each row representing a subject or block. Then select Column analysis > One-way ANOVA (and Nonparametric or Mixed). On the Experimental Design tab, select “Each row represents matched, or repeated measures, data.” For the Distribution assumption, select Nonparametric. Prism will then use the Friedman test.