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Table 2 Null hypotheses on correlations of individuals’ activities and roles in types of communication

From: Characterizing dynamic communication in online eating disorder communities: a multiplex network approach

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)