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Activity correlation
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The activities of users in a type of communication are unrelated to those in other types of communication.
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Hypergeometric model (Nicosia and Latora 2015)
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Role correlation
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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.
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Independent multilayer node-permutation model (Croft et al. 2011)
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Link overlap
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Users’ interconnections in one type of communication are unrelated to those in other communication.
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Independent multilayer configuration model (Paul and Chen 2016)
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Link-strength correlation
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The strength/frequency of interactions between two users in one type of communication is unrelated to those in other communication.
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Independent directed-weight reshuffling model (Opsahl et al. 2008)
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