Assessment of interjudge reliability in the open-ended questions coding process

In the process of coding open-ended questions, the evaluation of interjudge reliability is a critical issue. In this paper, using real data, the behavior of three coefficients of reliability among coders, Cohen's K, Krippendorff's alpha and Perreault and Leigh's I (r) are patterned, in terms of the number of judges involved and the categories of answer defined. The outcome underlines the importance of both variables in the valuations of interjudge reliability, as well as the higher adequacy of Perreault and Leigh's I (r) and Krippendorff's alpha for marketing and opinion research.