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based on this analysis, he said, "it's possible the Ripper could be female".

Based on this quote I've concluded that the Ripper was either male or female. Startling information indeed.

My prior would be p=0.167 (cite: Wikipedia, "one out of every six serial killers is a woman").

That's still way too high (after conditioning on the nature of the murders). Most all female serial killers are angels.