DROS–SVRD linkage (n=500 candidate pairs) | Mortality–SVRD linkage (n=500 candidate pairs) | |||
Inter-rater | Intrarater | Inter-rater | Intrarater | |
Expected agreement by chance alone (%) | 50.51 | 50.60 | 51.79 | 52.10 |
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.