Statistical method | Definition |
---|---|
Sensitivity | True positive rate, TPR = TP/ (TP + FN) |
Specificity | True negative rate, TNR = TN/ (FP + TN) |
PPV | Positive predictive value = TP/ (TP + FP) |
NPV | Negative predictive value = TN/ (TN + FN) |
Accuracy | = TP + TN/ (TP + FN + FP + TN) |
Cohen’s Kappa | Consistency; unordered dichotomous variables (kappa ≤ 0, consistency less than chance; kappa ≤ 0.20, slight consistency; kappa = 0.21–0.40, fair consistency; kappa = 0.41–0.60, moderate consistency; kappa = 0.61–0.80, substantial consistency; kappa > 0.8, almost perfect consistency) |
Cronbach’s α—inter rate correlation | Consistency; ordered classified variables (value > 0.90, high correlation; value = 0.8–0.9, acceptable correlation; value = 0.70–0.8, scale needs amending; value < 0.7, discard) |