1. A coefficient of agreement for nominal scales;Cohen;Educ Psychol Meas,1960
2. Statistical Methods for Rates and Proportions;Fleiss,1981
3. The occurrence of lung cancer in man;Levin;Acta Unio Int Contra Cancrum,1953
4. Weighted kappa: Nominal scale agreement with provision for scaled disagreement or partial credit;Cohen;Psychol Bull,1968
5. The importance of observer error in the interpretation of photofiuorograms and the value of multiple rating;Yerushalmy;Int Tuberculosis Yearbook,1956