• Fragility Index Calculator

    Tool to calculate the fragility index of a study, which is one metric of how robust the results of a study are. The fragility index is calculated by changing the status of a patient from a non-event to an event until statistical significance is lost (p>0.05). The fragility index is the number of patients required to lose statistical significance within a study.

  • Number Needed to Treat

    Tool to calculate the number needed to treat (NNT) between two independent groups.

  • Odds Ratio to Risk Ratio Conversion

    Tool to convert OR (odds ratio) to RR (risk ratio) from logistic regression.

  • Post-hoc Power Calculator

    Calculator to determine the post-hoc power of an existing study.

  • Sample Size Calculator

    Calculator to determine the minimum number of subjects to enroll in a study for adequate power.


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Updated May 21, 2016
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