Dissertation Information for Abdullah Al-ShehriNAME:
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SCHOOL: ADVISORS: COMMITTEE MEMBERS: MPACT Status: Incomplete - Not_Inspected Title: Organization and effectiveness of n-gram approach for indexing and retrieval in Arabic information retrieval systems Abstract: This dissertation explores a valid alternative to the word method for indexing and retrieving Arabic documents based on a finite number of word fragments, called n-grams. Based on the statistical properties of n-grams in six Arabic corpora, an optimization function of the size of n-grams is developed in terms of entropy and computational cost of n-grams. Two n-gram-based methods for indexing and retrieving Arabic documents are developed: optimal n-grams and extended optimal n-grams. The former uses optimal size of n-grams and the latter eliminates noisy optimal n-grams and expands them to a higher order of n-grams. An experimental Arabic 1RS was designed to conduct several retrieval experiments on two Arabic document collections: the SACS and the Al-Raya. The retrieval results of the n-gram-based methods are contrasted and compared to the word method in terms of precision-recall scores. In addition, the study investigates the effects of centroid vectors on the retrieval effectiveness of the word-based indexing method and the n-gram-based indexing methods. |
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