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gjm comments on [LINK] XKCD Comic #1236, Seashells and Bayes' Theorem - Less Wrong Discussion
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Comments (32)
Either he's fixed it since the two of you wrote what you wrote, or you're wrong, or I'm terribly confused. It now says (with obvious abbreviations)
P(A|B) = P(B|A)P(A)/P(B)
which is correct.
Make that all four of us are wrong. Yes, it seems that the cartoon has been fixed. I quadruple checked the positions of those clauses when I was verifying nshepperd's claim, since it was surprising. I also observed at the time that it is fortunate that the image would be easy to fix even with my meagre gimp skills. Or MSPaint from windows 95 for that matter.
EDIT: The xkcd forum confirms our sanity and shows the original.
The image in the forum shows the fixed version, at least for me right now. (Maybe it will for you too, if you clear your browser cache? Or maybe there's a copy of the old version elsewhere in the discussion.)
I think he should have put a note on the comic page acknowledging that he'd fixed a mistake.
The old version is there if you scroll down.
He fixes things a lot. There is practically never a notice.