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> For those with positive coefficients we can expect that the language is associated with, ceteris paribus, a greater number of defect fixes. These languages include C, C++, JavaScript, Objective-C, Php, and Python. The languages Clojure, Haskell, Ruby, Scala, and TypeScript, all have negative coefficients implying that these languages are less likely than the average to result in defect fixing commits.

Notice how top projects in popular languages do have tendency to have more fixes than top projects in more obscure languages. Perhaps these projects have simply more users, leading to more reported bugs and community pressure? Interesting paper, but it is all to easy to jump to conclusions.