Sim_Stojanovic_2001
Sim_Stojanovic_2001(dag, terms, verbose = simona_opt$verbose)It is purely based on the depth of term a, b and their LCA c.
sim = depth(c)/(depth(a) + depth(b) - depth(c))The similarity value might be negative because there is no restrction that the path from root to a or b must pass c.
Paper link: doi:10.1145/500737.500762 .