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I understood it to mean that it had 1/4 the error rates they were previously seeing.



Huh, that's not even one I considered. I guessed 1/5, so the change was 4x the final value. Either way it's wrong - "dropped by X%" should be calculated as (original - final) / original.


This is exactly right :)


Then it dropped by 75%.


Yes. It was a blunder. The post has been updated to reflect this.




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