The diagPrimer app offers an interactive and informative platform to delve into the realm of diagnostic test accuracy. In the field of medicine, diagnostic tests play a crucial role in guiding treatment decisions. Many test results are measured on a continuous scale, such as the levels of specific chemicals in blood samples. However, to categorize patients into those with or without the disease being tested for, a threshold or cut-off value is necessary. diagPrimer explores the measurement of test performance and its implications. diagPrimer considers a test that measures a continuous scale, assuming normally distributed values for both individuals with the disease and those without (referred to as 'healthy' moving forward, although they may have other diseases not being tested for).

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