Table 2

Inter-rater and intrarater reliability of manual review

DROS–SVRD linkage
(n=500 candidate pairs)
Mortality–SVRD linkage
(n=500 candidate pairs)
Inter-raterIntraraterInter-raterIntrarater
Expected agreement by chance alone (%)50.5150.6051.7952.10
Observed agreement (95% CI)94.20% (91.78% to 96.08%)93.40% (90.86% to 95.41%)91.80% (89.04% to 94.05%)92.60% (89.94% to 94.74%)
Kappa (95% CI)0.88 (0.83 to 0.91)0.87 (0.82 to 0.90)0.83 (0.77 to 0.87)0.85 (0.79 to 0.89)
  • DROS, Dealer Record of Sale database; SVRD, Statewide Voter Registration Database.