RT Journal Article SR Electronic T1 Bootstrap estimate of the variance and confidence interval of kappa. JF British Journal of Industrial Medicine JO Br J Ind Med FD BMJ Publishing Group Ltd SP 503 OP 504 DO 10.1136/oem.48.7.503 VO 48 IS 7 A1 K P Fung A1 J Lee YR 1991 UL http://oem.bmj.com/content/48/7/503.abstract AB