While working at the Visual Analytics Lab at Tufts, I got to work under PhD candidate Abby Mosca and created a visualization for Bayes Theorem using the Javascript library D3.

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This visualization works by a user inputting three percentages: population with some disease, test accuracy, and false positives. Using this information, the grid will show you the population with and without the disease as well as the positive and negative test results for those populations.

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It then asks you that given a positive test result, how many patients actually have the disease.