statistics.txt

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  1. Sensitivity
    TP/(TP+FV)

    Only includes numbers about subjects with disease

    Sensitivity rules out (SNOUT)
  2. Specificity
    TN/(TN+FP)

    Only includes numbers on subjects without disease

    Specificity rules in (SPIN)
  3. Draw the bayesian foursquare
    Image Upload
  4. Positive Predictive Value
    Likelihood of disease in subject with positive test

    PPV=TP/(TP+FP)

    • depends on prevalence
    • (if uncommon, number of FP increases and PPV decreases)
    • good PPV means good screening
  5. Negative Predictive Value
    Likelihood of not having disease if tested negative

    NPV=TN/(TN+FN)

    • Depends on prevalence
    • (if common, number of FN increases and NPV decreases)
  6. type 1 error
    concluding difference when non exists (think drug companies)
  7. type 2 error
    concluding no difference when one does exist
  8. number needed to treat
    inverse of absolute risk reduction

Card Set Information

Author:
jmeglin
ID:
27529
Filename:
statistics.txt
Updated:
2010-07-21 12:56:34
Tags:
Peds Boards Statistics
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Description:
Statistics
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