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Let me now build your life harder. Suppose our probability of a certain other kind of disease is 0.1, so 10% of the population has it. Our test in the positive action is genuinely informative, but there’s a 0.5 likelihood that if I’m cancer-free the test, surely, says the same thing. So the predisposition is high, the specificity is lower. And let’s start by filling in the first 3 of them ..
