Bayes iPhone and iPad App


Quickly calculate post-test probabilities based on pre-test probability, sensitivity, and specificity.

Manipulate the sliders for pre-test probability, sensitivity, and specificity to visualize the relationships in the graphical sample space.

The probability, sensitivity, and specificity values can also be input directly for specific tests.

The four color graphical sample space area provides an intuitive understanding of the ratios between:
False Positives
False Negatives
True Positives
True Negatives

The generated calculations (to six decimal places) are updated automatically and show:

Post-test Probability if the test result is positive
Post-test Probability if the test result is negative

Positive Predictive Value (PPV)
Negative Predictive Value (NPV)

Positive Likelihood Ratio (LR+)
Negative Likelihood Ratio (LR-)

Easily share resulting calculations via email.

Screenshots below. Available for iPad and iPhone devices on the App Store.


by Brian Drye. To view all my applications, visit the App Store.

Credits and Trademarks: Apple, the Apple logo, iPad, iPhone, iPod, and iTunes are trademarks of Apple Inc., registered in the U.S. and other countries.