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twanvl comments on Bayesianism for Humans - Less Wrong

52 Post author: ChrisHallquist 29 October 2013 11:54PM

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Comment author: twanvl 30 October 2013 01:30:16PM 4 points [-]

The question is whether 'change' signifies only a magnitude or also a direction. The average magnitude of the change in belief when doing an experiment is larger than zero. But the average of change as vector quantity, indicating the difference between belief after and before the test, is zero.

If you drive your car to work and back, then the average velocity of your trip is 0, but the average speed is positive.