nLongest Repeating Subsequence Model [Pitkow 99]
nSurfing
paths can be represented as n-grams <X1, X2,…Xn> to indicate sequences of page clicks by a population of users visiting a web site
nFind Longest repeating subsequence
nE.g., 135 in 15135213544
nMatch the performance accuracy of the one-hop Markov model while
reducing the complexity by nearly 33%