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This analysis fails to take into account the popularity of a language. The repository of a library is likely to have more users if it's written in a popular language, and these users will probably report more bugs and feature requests.

Considering this I'm not surprised at all to see that Java, Python and C++ repositories have a higher "bug density" than Clojure, Go or Erlang ones.

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What about Ruby?

What about JavaScript?

I'm not saying that this metric measures language popularity, but that language popularity seems to have a big influence on it. I may be wrong, but that's what caught my eye when I read the article. There are plenty of other factors that aren't accounted for, some of which have been pointed out by other commenters.

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