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Issue No.03 - May (1983 vol.9)

pp: 365-370

R.L. Kashyap , School of Electrical Engineering, Purdue University

ABSTRACT

Let T(U) be the set of words in the dictionary H which contains U as a substring. The problem considered here is the estimation of the set T(U) when U is not known, but Y, a noisy version of U is available. The suggested set estimate S*(Y) of T(U) is a proper subset of H such that its every element contains at least one substring which resembles Y most according to the Levenshtein metric. The proposed algorithm for-the computation of S*(Y) requires cubic time. The algorithm uses the recursively computable dissimilarity measure Dk(X, Y), termed as the kth distance between two strings X and Y which is a dissimilarity measure between Y and a certain subset of the set of contiguous substrings of X. Another estimate of T(U), namely SM(Y) is also suggested. The accuracy of SM(Y) is only slightly less than that of S*(Y), but the computation time of SM(Y) is substantially less than that of S*(Y). Experimental results involving 1900 noisy substrings and dictionaries which are subsets of 1023 most common English words [11] indicate that the accuracy of the estimate S*(Y) is around 99 percent and that of SM(Y) is about 98 percent.

INDEX TERMS

text editing, Error correction in strings, Levenshtein metric, noisy substring matching, string dissimilarity in terms of the dissimilarity of their substrings, string set estimation

CITATION

R.L. Kashyap, "The Noisy Substring Matching Problem",

*IEEE Transactions on Software Engineering*, vol.9, no. 3, pp. 365-370, May 1983, doi:10.1109/TSE.1983.237018