Abstract
This paper studies Chinese character-based n-grams used in copy detection by Sogou Chinese News Corpus. Texts were compared each other to find out the same news event written by different authors which were viewed as plagiarism by variable length (2<=n<=10) n-gram comparisons. The experiments show that unlike English, higher level (n={4, 5}) n-gram can improve precision significantly with no recall declined in Chinese text copy detection.
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