Checks whether a network (a graph) is multilevel according to the linked design proposed by Lazega et al (2008).
A graph object.
A multilevel network can be defined as a network with two kinds of vertex and two kinds of edges: Vertices on the lower level are, usually, individuals. Vertices on the higher level are, usually, organizations, collectivities or other kinds of social joint structures. The first kind of edges are those between the vertices of the higher level and between the vertices of the lower level. The second kind of edges are those between the vertices of different levels (affiliation ties).
Put another way, a multilevel network is a bipartite network (2-mode) that has ties between nodes on both levels.
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Lazega, E., Jourda, M. T., Mounier, L., & Stofer, R. (2008). Catching up with big fish in the big pond? Multi-level network analysis through linked design. Social Networks, 30(2), 159-176.
Lazega, E. and Snijders, Tom A.B. (eds) (2016), Multilevel Network Analysis for the Social Sciences: Theory, Methods and Applications, Springer, Methodos Series.
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