However, with discounting, the value becomes positive for uniformly dense clusters, because the frequencies of individual cells are always smaller than their agglomeration and so the discounting effect is stronger for the former.
using the same formula, we calculated the significance weights t i in c = (S T , S D ) as: and the significance weights of d j as: all the terms and documents in a cluster can be jointly ordered according to their contribution in the entropy calculation given by Eq.