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endoself comments on A History of Bayes' Theorem - Less Wrong
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Wikipedia defines the ban as the amount of information in a decimal digit and makes the observation, due to I. J. Good, that a deciban is approximately the smallest intuitively perceptible change in evidence.
Hmmm, McGrayne's book says that Turing thought the ban was about the smallest change in weight of evidence directly perceptible to human intuition. Maybe Good had a different intuition about the measure, later.
I think a simple mistake is far more likely. A ban corresponds to an odds ratio of 10:1, clearly well within the range of perception.