GroupSim_SimCOU

GroupSim_SimCOU

GroupSim_SimCOU(
  dag,
  group1,
  group2,
  IC_method = NULL,
  verbose = simona_opt$verbose
)

Methods

GroupSim_SimCOU

It is based on the dot product of two vectors p and q which correspond to terms in group1 and group2. p and q have the same length as the total number of terms. Value of position i in p or q corresponds to term t. The value takes IC(t) if t is an ancestor of any term in p or q, and the value takes zero if t is not. The similarity betweem group1 terms and group2 terms is calculated as:

<p,q>/||p||/||q||

where <p,q> is the dot product between the two, and ||p|| or ||q|| is the norm of the vector. The equation can be written as:

group_sim = sum_{x in intersect(A, B)}(IC(x)^2) / 
              sqrt(sum_{x in A}(IC(x)^2)) / 
              sqrt(sum_{x in B}(IC(x)^2))

IC method can be set via control = list(IC_method = ...).