The Bayes theorem
In order to understand the Bayes theorem first, before we attempt to take a look at the Naïve Bayes classification method, we should consider this example. Let's assume that among all the people in the U universe, the set of people who have breast cancer is set A, and set B is the set of people who had a screening test and were unfortunately diagnosed with the result positive for breast cancer. This is shown as the overlap region A∩B in the following diagram:
There are two unusual areas that need focus: B – A∩B or people without breast cancer and with a positive test on diagnosis and the event A – A∩B or people with breast cancer ...
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