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Exact distribution for the local score of one i.i.d. random sequence
1Université de Toulouse II, UFR SES, Math-Imb, Toulouse, France. mercier@univ-tlse2.fr
Abstract:
Let X(1)...X(n) be a sequence of i.i.d. positive or negative integer-valued random variables and H(n) = max(0 < or = i < or = j < or = n)(X(i) +...+ X(j)) be the local score of the sequence. The exact distribution of H(n) is obtained using a simple Markov chain. This result is applied to the scoring of DNA and protein sequences in molecular biology.
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