Title: I remember reading an article a year or so ago about (the NSA) identifying users based on how they write: vocabulary, spelling mistakes, grammar, dialect, and so on.<p>This is interesting to me because it is extremely difficult to change the vocabulary I use in writing and speaking. Being able to estimate the amount of similarity between two pieces of text would be useful.<p>The closest I can think of right now would be the proprietary algorithms used to check for plagiarism (for schools and universities, for instance).<p>Are there any publicly available algorithms for this? Where can I go to learn more? (Academic journals?) Am I just DDGing the wrong search terms?
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