Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Mark Chatfield and Adrian Mander,The Skillings–Mack Test (Friedman Test when There are Missing Data),The Stata Journal: Promoting communications on statistics and Stata,1536-867X,SAGE Publications,2009-08,9,2,299-305,https://cir.nii.ac.jp/crid/1360855569668044672,https://doi.org/10.1177/1536867x0900900208