byrnema comments on Amanda Knox: post mortem - Less Wrong

23 Post author: gwern 20 October 2011 04:10PM

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Comment author: byrnema 21 October 2011 08:38:06PM 0 points [-]

I would say that sending an individual with 13% probability of innocence to jail is clearly wrong, because 1 out of 10 of them would be innocent.

So the premise instead is: adding a 13% innocent population of any subset or category of individuals to jail is clearly wrong

leading to the conclusion: sending an individual with only 87% probability of guilt to jail is wrong

Comment author: lessdazed 22 October 2011 02:53:21AM 2 points [-]

I would say that sending an individual with 13% probability of innocence to jail is clearly wrong, because 1 out of 10 of them would be innocent.

One wonders how many of those are people the jury correctly thinks have done other crimes, or subjectively think deserve more punishment for past crimes. That would be a different malfunction from the expressed intent of the system and would imply the system otherwise does much better than the 87/13 ratio.

Comment author: steven0461 21 October 2011 08:58:30PM *  1 point [-]

Yes, that's what I meant by what I said. But the problem is that, at least to me, the premise is no more obvious than the conclusion.

Comment author: byrnema 21 October 2011 09:17:35PM 1 point [-]

I see. It's a little more obvious to spell out "more than 1 out of 10 innocent" instead of "only 87% probablity of guilt" but if you see them as immediately equivalent then indeed the argument will do nothing for you.