This paper presents and tests a formal mathematical model for the analysis of informant responses to systematic interview questions. We assume a situation in which the ethnographer does not know how much each informant knows about the cultural domain under consideration nor the answers to the questions. The model simultaneously provides an estimate of the cultural competence or knowledge of each informant and an estimate of the correct answer to each question asked of the informant. The model currently handles true-false, multiple-choice, and fill-in-the-blank type question formats. In familiar cultural domains the model produces good results from as few as four informants. The paper includes a table showing the number of informants needed to provide stated levels of confidence given the mean level of knowledge among the informants. Implications are discussed.
American Anthropologist is the flagship journal of the American Anthropological Association. The journal advances the Association's mission through publishing articles that add to, integrate, synthesize, and interpret anthropological knowledge; commentaries and essays on issues of importance to the discipline; and reviews of books, films, sound recordings, and exhibits.
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© 1986 American Anthropological Association
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