Too small a window will lose a lot useful information, which makes internal relation of community not tight enough, and will lose many important relations of NE pairs.
we modify e ij because of weighted network, as in equation 4; Tr(e)=∑ i e ii gives the fraction of edges in the network that connect vertices in the same community; ‖e‖indicates the sum of the ele ents of the matrix e. m where e is an edge connectin ion.