I was reading "A genomic code for nucleosome positioning" (by Eran Segal et al). And I am having 2 doubts.
The figure(b) in this image from the paper shows the graph of fraction (3-bp moving average) of AA/TA/TT dinucleotides of nucleosome dna sequence they analysed statistically as far as I understand. What is 3-bp moving average here? I also don't understand how they chose 0th position (the so called dyad). Also what does it mean to have oscillations (correlation?) in this graph?
UPDATE : I am adding some supplementary information related to finding the dinucleotide fractions. Still I don't understand why is the fraction found so?