[erichocean]

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

[dllthomas]

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.

[apurvamehta]

This is exactly right :)

[caf]

Then it dropped by 75%.

[apurvamehta]

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