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Effect of Morphological Analysis on Quality of Information Retrieval

The article contains results of an experimental study of the effect of different morphological analysis methods on the quality of an informational retrieval system's search quality. It is commonly accepted that morphological analysis can significantly improve recall of information search. Especially this is important for inflective languages such as Russian language. We studied three publicly available modules which can be used for stemming or normalization. One of them uses dictionary based approach other two are rules-based. We use a system without any morphological processing as a basic line. Also we studied variant with manual suffix stripping using wildcards.

  The RIRES search quality evaluation methodology was used. This methodology is similar to TREC methods and uses Russian document and query collections.

  Our experiments show that morphological analysis significantly improves not only recall but also search precision. Very close characteristics of search quality was shown by all methods of morphological analysis and manual wildcards stripping.