Document frequency is used in various applications in Information Retrieval and other related fields. An\ud assumption frequently made is that the document frequency represents a level of the term’s specificity. However,\ud empirical results to support this assumption are limited. Therefore, a large-scale experiment was carried out,\ud using multiple corpora, to gain further insight into the relationship between the document frequency and terms\ud specificity. The results show that the assumption holds only at the very specific levels that cover the majority of\ud vocabulary. The results also show that a larger corpus is more accurate at estimating the specificity. However,\ud the co-occurrence information is shown to be effective for improving the accuracy when only a small corpus is\ud available
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