Updating on evidence that hasn't arrived yet?
Not quite. I think the point is that because we aren't perfect Bayesian reasoners, we neglect to update on some of the available evidence. But getting into the right frame of mind can help you avoid that. (Cf. the reasoning behind Harry's decision to tell McGonagall about the Parseltongue message from the sorting hat.)
The heuristic Harry is using here, is to imagine a future test he thinks would be decisive, and ask himself what outcome he expects from that test. That's a way to "unlock" and find out about your beliefs about the present.
Personally, I get very little use out of this technique, since my problem tends to be uncertainty about the likely consequences of my actions, not uncertainty about which outcome would be best.
Personally, I get very little use out of this technique, since my problem tends to be uncertainty about the likely consequences of my actions, not uncertainty about which outcome would be best.
Have you tried it on a micro-scale? I employ a modified version of this technique as a constant motivation tool. (Eg, I don't feel like going to the gym and prefer to read things on the internet, so I query my future self from 4 hours ahead and future self from a couple days ahead for each Everett branch of action and poll my imagination of their opinions. Inva...
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This is a new thread to discuss Eliezer Yudkowsky’s Harry Potter and the Methods of Rationality and anything related to it. This thread is intended for discussing chapter 85. The previous thread has long passed 500 comments. Comment in the 15th thread until you read chapter 85.
There is now a site dedicated to the story at hpmor.com, which is now the place to go to find the authors notes and all sorts of other goodies. AdeleneDawner has kept an archive of Author’s Notes. (This goes up to the notes for chapter 76, and is now not updating. The authors notes from chapter 77 onwards are on hpmor.com.)
The first 5 discussion threads are on the main page under the harry_potter tag. Threads 6 and on (including this one) are in the discussion section using its separate tag system. Also: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15.
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