10.2 Social Networks

The package igraph contains data on a Social network of friendships between 34 members of a karate club at a US university in the 1970s.

See W. W. Zachary, An information flow model for conflict and fission in small groups, Journal of Anthropological Research 33, 452-473 (1977).

  1. Get a graph of the cpmmunities within the social network.
    • Check the manual, or any online source to figure out what these measures mean and how they are calulated.
# Community membership
karate <- graph.famous("Zachary")
wc <- walktrap.community(karate)
plot(wc, karate)
modularity(wc)
membership(wc)
  1. It is also possible to get the adjacency matrix
get.adjacency(karate)
 - What do the columns, rows and 0s and 1s stand for?