statistics.txt

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Author:
jmeglin
ID:
27529
Filename:
statistics.txt
Updated:
2010-07-21 08:56:34
Tags:
Peds Boards Statistics
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Description:
Statistics
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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
  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

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