Reasonable metrical choices are, e.g., the Jaccard coefficient (Jaccard, 1912) between these sets<cite> (Antoniak and Mimno, 2018</cite>; Chugh et al., 2018) , or a percentage based coefficient (Hellrich and Hahn, 2016a,b; Wendlandt et al., 2018; Pierrejean and Tanguy, 2018) .