Abstract
We propose two Japanese information retrieval methods that enhance retrieval effectiveness using relationships between words. One is a method using dependency relationships between words in a sentence, and another is a method using the ordered co-occurrence information of words in a sentence as an approximation to the dependency relationships between them. Through retrieval experiments using the Japanese test collection for information retrieval systems NTCIR-1, we showed our two methods are superior to the TF-IDF method in retrieval effectiveness and the difference between our two methods is small. These results are independent of the document set and of the search topic set.
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