Hi guys, I'm using the list! Yeah, doing a bit of Info Theory and coding, in 2001 Paper 9 Q 10 there's a big section on autocorrelation. Searched for ages to actually find the autocorrelation integral, but can't really find any details that would help in answering the question fully. This question will probably not come up again this year but still would like to know the answer, Cheers Alvin