statistics specificity sensitivity PPV NPV positive predictive value - negative predictive value

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  1. positive and negative predictive value 
    1. different from specificity and sensitivity
    2. depend on prevalence in population  



  1. Prevalence in population is not shown in this figure 
  2. eg mammogram - PPV is 10 percent 
    1. false positive is more than 50 % if 10 mammograms in 10 years
  3. mammogram negative is 99.5 certaintly
    1. still 0.5 % chance of being wrong =
  4. PPV is useful for the patient, 
    1. while sensitivity is more useful for the physician



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