The purpose of this paper is to describe a method of indexing interobserver reliability from data relating to mutually exclusive nominal categories. The computer program to be described computes estimates of reliability from nominal data collected in a time interval manner. A specified critical time interval, the order of the responses, and the number of responses are important factors in computing the amount of agreement between judges.
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Scott, E. A., Reliability of content analysis: The case for nominal scale coding. Public Opinion Quarterly , 1955, 19, 321-325.