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Manfred comments on XKCD - Frequentist vs. Bayesians - Less Wrong Discussion

18 Post author: brilee 09 November 2012 05:25AM

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Comment author: Manfred 09 November 2012 09:28:20PM 2 points [-]

neither the Sun has exploded nor the dice come up 6

Given the statement of the problem, this null hypothesis is not at all probabilistic - we know it's false using deduction! This is an awful strange thing for a hypothesis to be in a problem that's supposed to be about probabilities.

Comment author: gwern 09 November 2012 10:59:15PM 0 points [-]

Since probabilistic reasoning is a superset of deductive logic (pace our Saint Jaynes, RIP), it's not a surprise if some formulations of some problems turn out that way.

Comment author: Manfred 10 November 2012 12:37:03AM *  0 points [-]

probabilistic reasoning is a superset of deductive logic (pace our Saint Jaynes

Ah, you mean like in chapter 1 of his book? :P

Anyhow, I think this should be surprising. Deductive logic is all well and good, but merely exercising it, with no mention of probabilities, is not the characteristic behavior of something called an "interpretation of probability." If I run a vaccine trial and none of the participants get infected, my deductive conclusion is "either the vaccine worked, or it didn't and something else made none of the participants get infected - QED." And then I would submit this to The Lancet, and the reviewers would write me polite letters saying "could you do some statistical analyses?"

Comment author: gwern 10 November 2012 01:23:40AM 0 points [-]

And you might say 'well, I don't know what 'something else' is, I can't define it as a limit of any frequency!' At least, not with more info than is presented in a 3 panel comic. ('I am pretty darn sure about that disjunction, though.')

Comment author: MixedNuts 09 November 2012 10:49:44PM 0 points [-]

"The machine has malfunctioned."

Comment author: Eliezer_Yudkowsky 09 November 2012 11:01:49PM 4 points [-]

Why, I deny that, for the machine worked precisely as XKCD said it did.