: How many errata are too many? I'm not sure this is the right Stack Exchange Community for this question, but here I go. I bought a book on Machine Learning from a (I believe) popular publisher

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I think you mean "errors" rather than "errata". A book's errata is usually a list of errors that have been noted and are corrected on a separate page. You don't see errata so much these days—it's cheaper to correct the error and reprint it, and there's less of a financial inducement to print the errors on a separate sheet.

5 errors in 50 pages might be acceptable, depending on the nature of the errors. If it's a book on programming, and the errors mean that most of the programs don't work as printed, this is unacceptable. But if it's a missing comma here or there, then it sounds normal, and possibly better than average. Some people's "errors" are issues of style—for example, the so-called Oxford comma.

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Annoying as it is, I have often found at least this number of errors. I usually expect most code samples to be correct and work -- expect is different to finding they actually will run. However, I have found numerous errors in explanatory text. Often books will have online errata lists that you can consult.

If you try it yourself, you will find it is incredibly hard to get books like this perfect.

Second and third editions (if they make it that far, which most coding books don't) should have less errors.

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That's not acceptable for a - book on an established subject from an established publisher. It indicates that the publisher and author are not performing adequate editorial and technical reviews. However, if this was an inexpensive self-published e-book on Amazon, your expectations for quality should be much lower.

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The number of errors you describe are a lot for a technical manual. More than needing better proofreading to check spelling, it sounds like this book really needed better copyediting to catch the errors in code and word reversals. I would contact the publisher with a list of the errors found. While you may not be able to return the book, you will be providing a service to the publisher (and to those who will benefit by corrections in a later edition) by reporting the problems.

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If the errors make the book unusable — for example, switching "row" and "column" makes what you're reading unworkable — I'd look for a way to contact the publisher and inform it about the errors. Then find another book to use as a backup or cross-reference.

If they're just spelling mistakes or the word switching is really obvious, then you're probably okay.

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Yes, it's a lot by almost any standard, and is a sign of inadequate proof-reading.

But from there, one can only say, So what? Are you going to report the author to the Library Police?

If by errata you mean simply typos -- mis-spellings, punctuation errors, that sort of thing -- and otherwise it's a good book, I'd say "oh well" and ignore them. If by errata you mean errors of fact, and these errors really matter, if they render the book unreliable, then I'd say to give up on this book and find a better source of information. You say the errors aren't "huge" so, etc.

If you were involved in publishing this book, I'd say this would be evidence that you need better proof-reading. But if you're simply a reader, there's nothing you can do about it, so I wouldn't worry about it.

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