In my previous post, I described an indicator I just invented called the Relative Performance Index. In this post, I'd like to describe how to interpret it.
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Item 4 is confusing. The title and first paragraph talk about false positives. The second paragraph talks about false negatives. Both might be nonlinear.
4 false positives buried in 1300 spams can very easily result in the recipient not noticing 2 of the false positives. But 2 false positives buried in 1300 spams could have the same result. I think false positives are a big problem, even though the measurement is nonlinear.
9 spams in the inbox together with 1 legitimate message is highly irritating but I think this measurement is more likely to be linear. On the other hand, it might yield the same result as above: the recipient might not notice that there's a legitimate message in their inbox.