IC_Zhang_2006

IC_Zhang_2006

IC_Zhang_2006(
  dag,
  use_cache = simona_opt$use_cache,
  verbose = simona_opt$verbose
)

Methods

IC_Zhang_2006

It measures the number of ways from a term to reach leaf terms. E.g. in the following DAG:

     a      upstream
    /|\
   b | c
     |/
     d      downstream

term a has three ways to reach leaf, which are a->b, a->d and a->c->d.

Let's denote k as the number of ways for term t to reach leaves and N as the maximal value of k which is associated to the root term, the information content is calculated as

IC = -log(k/N) 
   = log(N) - log(k)

Paper link: doi:10.1186/1471-2105-7-135 .