Brennan, R.L., & Light, R.J. ( 1974). Measuring agreement when two observers classify people into categories not defined in advance. British Journal of Mathematical and Statistical Psychology, 27, 154-163.
2.
Cohen, J. ( 1960). A coefficient of agreement for nominal scales. Educational and Psychological Measurement, 20, 37-46.
3.
Holley, J.W., & Guilford, J.P. (1964). A note on the G index of agreement. Educational and Psychological Measurement, 24, 749-753.
4.
Hubert, L.J. ( 1977). Nominal scale response agreement as a generalized correlation . British Journal of Mathematical and Statistical Psychology , 30, 98-103.
5.
Janson, S., & Vegelius, J. ( 1978). On the applicability of truncated component analysis based on correlation coefficients for nominal scales. Applied Psychological Measurement, 2, 135-145.
6.
Janson, S., & Vegelius, J. ( 1982). The J index as a measure of nominal scale response agreement . Applied Psychological Measurement, 6, 111-121.
