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Whoops, you're right, they're both false positives, but one is number of false positives as a percentage of messages marked as spam, and the other is number of
by DavidSJ 15y ago
Whoops, you're right, they're both false positives, but one is number of false positives as a percentage of messages marked as spam, and the other is number of false positives as a percentage of messages that aren't spam. The ratios would be completely different.
- prodigal_erik 15y agoOh yeah, there's only one absolute number of false positives, but when you turn it into a rate you have to choose either "of all positive results, what portion were false" or "of all test results, what portion were positive and false", which are far apart for tests that give many negative results.