Network Analysis
Ties, density, centrality, brokers and small worlds: the network ideas that help describe villages, kin groups and communities.
Small worlds and six degrees: what the folders, the model and the emails showed
Milgram's folders, the Watts and Strogatz rewiring model worked by hand, the 2003 email study, and what six degrees does and does not mean for villages and kin.
What the evidence says about Dunbar's number
Where the 150 in Dunbar's number comes from, the arithmetic behind it, what network studies find, and why a 2021 reanalysis and Dunbar's reply disagree.
Network density and centrality, worked by hand
Density, degree, closeness and betweenness computed by hand for a seven-household network, and what each number can and cannot tell an anthropologist.