Triadic Analysis of Affiliation Networks // Two principal tools are provided for the triadic analysis of affiliation networks: triad census and triadic closure. These include several variations on both classical tools tailored to affiliation network structure; see Opsahl (2013) doi:10.1016/j.socnet.2011.07.001, Liebig and Rao (2014) doi:10.1109/SITIS.2014.15, and Brunson (2015) doi:10.1017/nws.2015.38. Additional functions support manipulation of affiliation networks. Built on 'igraph' with new C++ calculations exposed via 'Rcpp'.