“…One popular effect size statistic recommended for single-case meta-analysis is Tau-U, a modified form of Kendall’s rank order correlation Tau (Parker, Vannest, & Davis, 2011; Parker, Vannest, Davis, & Sauber, 2011; Vannest, Parker, Gonen, & Adiguzel, 2016). Tau-U has been adopted in a number of single-case meta-analyses (e.g., Bowman-Perrott et al, 2013; Dart, Collins, Klingbeil, & McKinley, 2014; Whalon, Conroy, Martinez, & Werch, 2015). However, a number of limitations have been noted by Tarlow (2017b) regarding the original Tau-U statistic.…”