David MacKay's Research group, Cavendish Laboratory

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Information Theory, PR and NN

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I have been told that information theory disproves the theory of evolution. Is that true? If so, what book or source material is available on the subject?

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Is Typicality on the syllabus?

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What are the prerequisites for the information theory course?

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I have a problem with how to calculate the bit error of the (7,4) Hamming code. Specifically, I can't follow the assertion "when the noise vector has weight two, the parity bits and source bits are equally likely to be flipped, so the bit error is 3/7 the block error"

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I can't distinguish the line styles in fig 3.2, the probability density P(x|l) as a function of l.

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The negative part of Shannon's noisy coding theorem contains a function H2^-1(1- R/C) what does " H sub 2 to the minus 1" mean? Is it the inverse function, ie. the function such that ((H sub 2 to the minus 1) acting on (H sub 2) acting on x) gives 1?

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1. Regarding the inference of sigma_n and sigma_n-1 from data, for Gaussians. This sounds suspiciously like the maximum likelihood value for sigma is changing depending on whether we also calculate xbar or not. Is this true, or am I confused? 2. What is the difference between max likelihood and max posterior probability? Is it just the inclusion of a non-uniform prior?

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p380. top paragraph: var(PHI^) = var(phi)/R where PHI^ is our estimate of mean of phi from taking R samples obeying a probablity distribution, P. How do you prove this?

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