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brian_jaress comments on Outlawing Anthropics: An Updateless Dilemma - Less Wrong
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Comments (194)
What kind of funny business?
Let's just say that you don't draw blue.
OK, but I think Psy-Kosh was talking about something to do with the payoffs. I'm just not sure if he means the voting or the dollar amounts or what.
Sorry for delay. And yeah, I meant stuff like "only greens get to decide, and the decision needs to be unanimous" and so on
I agree that changes the answer. I was assuming a scheme like that in my two marble example. In a more typical situation, I would also say 2/3.
To me, it's not a drastic (or magical) change, just getting a different answer to a different question.
Um... okay... I'm not sure what we're disagreeing about here, if anything:
my position is "given that I found myself with a green marble, it is right and proper for me to assign a 2/3 probability to both being green. However, the correct choice to make, given the pecuiluarities of this specific problem, may require one to make a decision that seems, on the surface, as if one didn't update like that at all."
Well, we might be saying the same thing but coming from different points of view about what it means. I'm not actually a bayesian, so when I talk about assigning probabilities and updating them, I just mean doing equations.
What I'm saying here is that you should set up the equations in a way that reflects the group's point of view because you're telling the group what to do. That involves plugging some probabilities of one into Bayes' Law and getting a final answer equal to one of the starting numbers.