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Table 2 Null hypotheses on correlations of individuals’ activities and roles in types of communication
| Correlation | Null hypothesis | Null model |
|---|---|---|
| Activity correlation | The activities of users in a type of communication are unrelated to those in other types of communication. | Hypergeometric model (Nicosia and Latora 2015) |
| Role correlation | The roles of users in a type of communication (i.e., their positions in a type of communication network) are unrelated to those in other communication. | Independent multilayer node-permutation model (Croft et al. 2011) |
| Link overlap | Users’ interconnections in one type of communication are unrelated to those in other communication. | Independent multilayer configuration model (Paul and Chen 2016) |
| Link-strength correlation | The strength/frequency of interactions between two users in one type of communication is unrelated to those in other communication. | Independent directed-weight reshuffling model (Opsahl et al. 2008) |
