Fig. 4.
Correlations between the weights of the links in the cooccurrence networks and the degrees of the links' endpoints, as measured by plotting the weight wij of a link i–j versus the product of the degrees kikj. (Upper) Cooccurrence network of the tag Folksonomy of del.icio.us; each green dot corresponds to a link; the black circles represent the average over all links i–j with given product kikj. (Lower) Synthetic cooccurrence networks obtained from nRW = 5 × 104 RWs performed on a Watts–Strogatz network of 105 nodes. The black circles correspond to RWs of random lengths distributed according to P(l) ≈ l−3 and the red crosses to fixed-length RWs (l = 5).