Figure 1. Link correlation preservation in different resampling schemes.

A Article resampling maintains correlations between links and also correlations within links. For example, an article in journal J1 might cite articles from journal J2 together with articles in journal J3 (correlations between links). An article in journal J1 might also cite another journal J2 more than once (correlations within links). The right-hand side shows some examples of possible resampled networks that necessarily keep correlation between and within links. B Multinomial resampling only maintains the correlations within links. The examples of resampled networks on the right-hand side show that they could be generated without keeping between-links correlations. C Poisson resampling does not maintain any link correlation. Every link of a resampled networks is generated independently of others.