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Table 1 Methods to computing measures of diagnostic accuracy

From: An administrative data validation study of the accuracy of algorithms for identifying rheumatoid arthritis: the influence of the reference standard on algorithm performance

  Reference standard Pre test prevalence = TP + FN TP + FP + FN + TN
RA cases Non-cases
Administrative data Positive True Positive (TP) False Positive (FP) PPV = TP TP + FP
Negative False Negative (FN) True Negative (TN) NPV = TN FN + TN
  Sensitivity = TP TP + FN Specificity = TN FP + TN Post test Prevalence = TP + FP TP + FP + FN + TN