What does % purity mean?

As applied to the results of a purity test, your purity is proportional to how many things in the domain of the test you have not done. The more you have done, the less pure (and more corrupt) you are in the test's domain. This means that answering yes to more questions will result in a lower purity. In other words, the foo test tells you how pure/uncorrupt you are in the domain of fooity, not how purely foo you are. If the nerd test tells you you're 99% nerd pure, it does not mean you're 99% pure nerd (ack!)
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