IC_Sanchez_2011

IC_Sanchez_2011

IC_Sanchez_2011(
  dag,
  use_cache = simona_opt$use_cache,
  verbose = simona_opt$verbose
)

Methods

IC_Sanchez_2011

It measures the average contribution of term t on leaf terms. First denote zeta as the number of leaf terms that can be reached from term t (or t's offspring that are leaves.). Since all t's ancestors can also reach t's leaves, the contribution of t on leaf terms is scaled by n_ancestors which is the number of t's ancestor terms. The final information content is normalized by the total number of leaves in the DAG, which is the possible maximal value of zeta. The complete definition of information content is:

IC = -log( (zeta/n_ancestor) / n_all_leaves)

Paper link: doi:10.1016/j.knosys.2010.10.001 .