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Table 1 Rate definitions (sensitivity, specificity, accuracy, precision)

From: Improving search filter development: a study of palliative care literature

  Gold Standard Reference Set
  Relevant Not Relevant
Medline Result   
   Articles retrieved a (correct inclusion) b (incorrect inclusion)
   Articles not retrieved c (incorrect exclusion) d (correct exclusion)
  1. Sensitivity = a/(a+c); specificity = d/(b+d); precision = a/(a+b); accuracy = (a+d)/(a+b+c+d)