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gwern comments on Less Wrong Polls in Comments - Less Wrong
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To anyone thinking this is not random, with 42 votes in:
The p-value is 0.895 (this is the probability of seeing at least this much non-randomness, assuming a uniform distribution)
The entropy is 2.302bits instead of log(5) = 2.322bits, for 0.02bits KL-distance (this is the number of bits you lose for encoding one of these votes as if it was random)
If you think you see a pattern here, you should either see a doctor or a statistician.
Well, it's worth noting people seem to be trainable to choose randomly: http://dl.dropbox.com/u/85192141/1986-neuringer.pdf
Apropos of the PRNG discussion in http://blog.yunwilliamyu.net/2011/08/14/mindhack-mental-math-pseudo-random-number-generators/ for which I wrote some flashcards: http://pastebin.com/CKif0fEf