An index first published in 2019 (see below). In practice, calculated values range between negative 2 and positive 2.
To measure the intensity of kin-based institutions—kinship intensity—we both created a Kinship Intensity Index (KII) using anthropological data for the world’s major ethnolinguistic groups and compiled rates of cousin marriage for countries and European regions (Fig. 1B). The KII is an omnibus measure for kinship intensity that captures the presence of cousin-marriage preferences, polygamy, co-residence of extended families, clan organization, and community endogamy.
Jonathan F. Schulz, Duman Bahrami-Rad, Jonathan P. Beauchamp, Joseph Henrich.
The Church, intensive kinship, and global psychological variation.
Science, vol 366, issue 6466, page 707 (8 Nov 2019).
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Last revised: 18 November 2019.