Several measures of distance between pairs of sequences, including the simple Hamming distance, the optimal matching distance and its variant, OMv, as described in Halpin, {it:Sociological Methods and Research}, 2010, Hollister's localised OM, Lesnard's dynamic Hamming distance, Time-Warp Edit Distance and a version of Elzinga's number of common subsequences for duration-weighted spell data. {p_end} Several utilities are also included.