Originally posted by Sam Flynn
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You're saying that establishing as a general statistic the background probability of knife assaults in the East End would help us to quanitfy the "randomness" or otherwise of a similar event. Fair enough. This I have no argument with.
But it seems to me that you're also saying that you see no validity whatsoever in producing a similar statistic, a 'background probabilty' of any event that may have occured in or around Dutfield's Yard that could have changed the outcome of a Ripper attack?
Such events could be anything that occured in or around the Yard between the departure of Schwartz and up to, but not necessarily including, the arrival of Diemschutz.
For example:
1)Any sound to came from inside the club door or elsewhere that may have alarmed the killer between about 12:45 and 1:00. In other words what's the background probablity of their being any potentially startling sounds in or around Dutfield's Yard at that time of night.
2)Any light going on in any window of any of the houses at the bottom end of the yard that may have alarmed the killer in the same period. What's the background probablity of there being one or more lights switched on or off in or around Dutfield's Yard?
3)Any unrecorded person that may have passed outside the yard and that may have alarmed the killer. What's the background probability of people walking past the Yard at that time of night? If we count only Schwartz and Diemshutz I'd say it was extremely high, wouldn't you?
4)Any unrecorded calls or screams made by Elizabeth Stride herself before he killed her that may have put him in fear of capture.
What's the background probability of any event or combination of events that may have occurred in that Yard that may have prevented the mutilations.
Your dismissal of these possible factors as 'excuses' is completely unwarranted.
I think that its perfectly reasonable to conclude that while the background probability of a 'random and unrelated' throat-slitting a ten minute walk (and less than an hour away) from a Ripper attack might be very high.
But similarly the background probability of any number of 'random and unrelated' events in or around the Yard that could have sent the Ripper scurrying away is also very high.
You can't uses statistics to weigh in favour of an unconnected killing because that knife cuts both ways, Sam.
Your general thesis seems to be 'No mutilations - no Ripper'. But another factor overlooked here is that Diemschutz himself stated that he believed the killer was still in the yard when he had entered, due to the warm temperature of the body and the continuingly odd behavior of his pony.To me this indicates he arrived within minutes of the murder. Who's to say it wasn't seconds and why do you dismiss this possibility so readily?
You say that the interruption scenario requires that we believe 'any one of an arbitrary range of possible interventions,' and I say that the background probability of any one of an arbititary range of interventions is extremely high. Once again, why dismiss them as a possibility so readily?
Regards,
Gary
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