These data record the participation of 5 African-American women in 5 social activities.
An affiliation network; see is_an
.
Davis, A., Gardner, B.B., & Gardner, M.R. (1941). Deep South: A Social Anthropological Study of Caste and Class. Columbia, SC: University of South Carolina Press. http://books.google.com/books?id=HGIdAAAAIAAJ