I want to find how much it differs between Pocket Medicine 6th edition and the previous 5th one in scale of percent of words or something similar.

I've revised the translation of the book for a publisher and now they want me to specify the number of pages that was beyond a mere revision; i.e. those I actually translated from scratch.

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    Just to clarify: you've translated the 6th ed. and want to know which parts of it were absent in the 5th? You're asking about actual new content, not merely stylistic improvements etc. to the content present in both eds, right? If I misunderstood your question, please edit the post to make it clearer. – user68958 Jun 23 '18 at 10:57
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    Sounds like you did not agree your price before hand and now they are finding a way to pay you a minimum ie only the full pages you worked on... – Solar Mike Jun 23 '18 at 12:03
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    So you have editable/searchable versions of both versions? This seems much more like a computing question. – StrongBad Jun 23 '18 at 13:52
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    There are whole articles written about the comparison of texts or measuring their similaritiy, see e.g. arxiv.org/abs/1604.05363. I think that your problem may not be easy to solve, unless you are a software engineer. – FuzzyLeapfrog Jun 23 '18 at 16:20
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    There are tools (e.g.winmerge.org) to compare two textfiles against each other. There should be a way to extract the text portion from the book (worst case: copy-paste) into a text file. The tool would then highlight the idfferences line by line. Plagiarism finders like copyleaks.com/compare could also work. – Andreas_B Jun 28 '18 at 14:11

There are several out-of-box tools that you can use to check the differences between two or more documents. I typically use the built-in merge feature of Mendeley that gives you a confidence interval when merging two documents. From that you can extrapolate if the documents are pretty similar or extremely different.

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