1. Text repetition rate: This is the most basic criterion for duplicate checking, that is, the ratio of text content in a paper to other published documents. Generally speaking, if the repetition rate exceeds 20%, it may be identified as plagiarism.
2. Structural repetition: In addition to the text content, the duplicate checking system will also check whether the structure of the paper is similar to other published papers. For example, the topics, research methods, results and conclusions of the two papers are the same, that is, the words used are not exactly the same, and they may also be considered plagiarism.
3. Citations and references: The duplicate checking system will also check whether the citations and references in the paper are accurate. If the quoted content is marked incorrectly, or the quoted content is too much, it may also be considered plagiarism.
There are mainly the following methods for duplicate checking:
1. Use duplicate checking software: There are many specialized duplicate checking softwares, such as Turnitin and Grammarly, which can automatically detect the repetition rate and plagiarism of papers. These softwares usually compare papers with a large number of documents in the database to find out possible plagiarism.
2. Manual duplicate checking: In addition to using duplicate checking software, you can also check duplicates yourself. This is mainly through reading and comparing their own papers and other documents to see if there are too many similarities.
3. Ask a professional for help: If you are not sure whether there is plagiarism in your paper, you can also ask a professional editor or tutor to check it for you. They have rich experience and professional knowledge, and can judge whether there is plagiarism in the paper more accurately.
Generally speaking, duplicate checking is a very important link and needs to be taken seriously. Only by ensuring the originality of the paper can the quality and social recognition of the paper be guaranteed.