The data are different, so it is impossible to accurately determine the difference of repetition rate between PaperYY Extreme Edition and HowNet. In most cases, the two are about 5% up and down. PaperYY data covers most journals, dissertations and Internet data. The more comprehensive the data, the higher the repetition rate.

However, the similar content cited by PaperYY can be detected in most cases, which is more cost-effective for the reference of previous revised papers. HowNet contains a joint comparison database, and the duplicate checking is more strict. After all, there are some differences in comparison libraries and algorithms of different detection systems, and the reference part of the article is also different. It is suggested that the first draft should be PaperYY Extreme Edition, and the final version should be finalized by HowNet, which greatly improves the pass rate.

Determinants of duplicate checking of papers

1. Whether the detection range is rich.

2. Whether the algorithm of duplicate checking rules is advanced and scientific, so different duplicate checking systems have different comparison databases, and the detection results of different algorithms and duplicate checking systems are completely incomparable, with no inherent mathematical relationship and no rules to follow.