PT - JOURNAL ARTICLE AU - Thomas McGinn AU - Peter C. Wyer AU - Thomas B. Newman AU - Sheri Keitz AU - Rosanne Leipzig AU - Gordon Guyatt for ED - , TI - Tips for learners of evidence-based medicine: 3. Measures of observer variability (kappa statistic) AID - 10.1503/cmaj.1031981 DP - 2004 Nov 23 TA - Canadian Medical Association Journal PG - 1369--1373 VI - 171 IP - 11 4099 - http://www.cmaj.ca/content/171/11/1369.short 4100 - http://www.cmaj.ca/content/171/11/1369.full SO - CMAJ2004 Nov 23; 171