1. Categorical Data Analysis;Agresti,1990
2. Discrete Multivariate Analysis. Theory and Practice;Bishop,1976
3. Coefficient kappa: some uses, misuses, and alternatives;Brennan;Educational and Psychological Measurement,1981
4. A coefficient of agreement for nominal scales;Cohen;Educational and Psychological Measurement,1960
5. Measuring nominal scale agreement among many raters;Fleiss;Psychological Bulletin,1971