Table 1. Key questions addressed by consensus analysis, estimates produced by the consensus analysis module in Anthropac (Borgatti 1996a), and guiding diagnostic criteria used in our study.

Question Estimates Guiding diagnostic criteria
1. To what extent does a group share a single cultural model (i.e., shared mental model)? Eigenvalue factor ratios Consensus
(single shared mental model)
  • Ratio between the first and second eigenvalue factors is ≥3.0 to 1.
No consensus If ratio between first and second factors is (Caulkins 2004):
  • 2.0 to 2.9 to 1, then have weak agreement.
  • <2.0 to 1, then have little/no agreement.
  • Presence of two (or more) factors of similar strength, then have two (or more) mental models (either overlapping/nonopposing, or contested).
Average (group) competence score
  • Scores normally range from 0 to 1.
  • The higher the average competence score, the higher the consensus.
  • If <0.3, then assumptions of cultural consensus model probably not met, i.e., no consensus (Romney et al. 1986).
2. To what extent does each respondent agree with the group’s cultural beliefs (mental model)? Individual competence score
  • Scores normally range from 0 to 1.
  • The higher the score, the more knowledgeable and in agreement with the group is the person.
  • A person with a negative score indicates that s/he has a very different or unusual understanding of the issue.
3. What are the “culturally appropriate answers” to each item mentioned by the group? Answer key
  • Meaningful only if the data show consensus.
  • Tells you the culturally agreed upon or “correct” answers, i.e., what the group agreed on were the components of the domain (or mental model).