between_centrality {manynet}

Measures of betweenness-like centrality and centralisation

Description

These functions calculate common betweenness-related centrality measures for one- and two-mode networks:

• node_betweenness() measures the betweenness centralities of nodes in a network.

• node_induced() measures the induced betweenness centralities of nodes in a network.

• node_flow() measures the flow betweenness centralities of nodes in a network, which uses an electrical current model for information spreading in contrast to the shortest paths model used by normal betweenness centrality.

• tie_betweenness() measures the number of shortest paths going through a tie.

• net_betweenness() measures the betweenness centralization for a network.

All measures attempt to use as much information as they are offered, including whether the networks are directed, weighted, or multimodal. If this would produce unintended results, first transform the salient properties using e.g. to_undirected() functions. All centrality and centralization measures return normalized measures by default, including for two-mode networks.

Usage

node_betweenness(.data, normalized = TRUE, cutoff = NULL)

node_induced(.data, normalized = TRUE, cutoff = NULL)

node_flow(.data, normalized = TRUE)

tie_betweenness(.data, normalized = TRUE)

net_betweenness(.data, normalized = TRUE, direction = c("all", "out", "in"))

Arguments

.data

An object of a manynet-consistent class:

• matrix (adjacency or incidence) from {base} R

• edgelist, a data frame from {base} R or tibble from {tibble}

• igraph, from the {igraph} package

• network, from the {network} package

• tbl_graph, from the {tidygraph} package

normalized

Logical scalar, whether the centrality scores are normalized. Different denominators are used depending on whether the object is one-mode or two-mode, the type of centrality, and other arguments.

cutoff

The maximum path length to consider when calculating betweenness. If negative or NULL (the default), there's no limit to the path lengths considered.

direction

Character string, “out” bases the measure on outgoing ties, “in” on incoming ties, and "all" on either/the sum of the two. For two-mode networks, "all" uses as numerator the sum of differences between the maximum centrality score for the mode against all other centrality scores in the network, whereas "in" uses as numerator the sum of differences between the maximum centrality score for the mode against only the centrality scores of the other nodes in that mode.

Value

A numeric vector giving the betweenness centrality measure of each node.

References

Everett, Martin and Steve Borgatti. 2010. "Induced, endogenous and exogenous centrality" Social Networks, 32: 339-344. doi:10.1016/j.socnet.2010.06.004

See Also

Other centrality: close_centrality, degree_centrality, eigenv_centrality

Other measures: close_centrality, degree_centrality, eigenv_centrality, measure_attributes, measure_closure, measure_cohesion, measure_features, measure_heterogeneity, measure_hierarchy, measure_holes, measure_infection, measure_net_diffusion, measure_node_diffusion, measure_periods, measure_properties, member_diffusion

Examples

node_betweenness(ison_southern_women)
node_induced(ison_adolescents)
(tb <- tie_betweenness(ison_adolescents))
plot(tb)
ison_adolescents %>% mutate_ties(weight = tb) %>% 
     graphr()
net_betweenness(ison_southern_women, direction = "in")