1. Agresti, A. (2002). Categorical Data Analysis, 2nd edn. Wiley, New York.
2. Allen-Mersh T. G., Earlam, S., Fordy, C., Abrams, K., and Houghton, J. (1994). Quality of life and survival with continuous hepatic-artery floxuridine infusion for colorectal liver metastases. Lancet, 344, 8932, 1255–1260.
3. Armitage, P. and Berry, G. (1994). Statistical Methods in Medical Research, 3rd edn. Blackwell, Oxford.
4. Chan, I. (1998). Exact tests of equivalence and efficacy with a non-zero lower bound for comparative studies. Stat. Med., 17, 1403–1413.
5. Cohen, J. (1960). A coefficient of agreement for nominal scales. Educ. Psychol. Meas., 20, 37–46.