This is disingenuous. Quoting the abstract: ``` Language design does have a significant, but modest effect on software quality. Most notably, it does appear that disallowing type confusion is modestly better than allowing it, and among functional languages, static typing is also somewhat better than dynamic typing. We also find that functional languages are somewhat better than procedural languages. ```

The "statically typed" languages that you're focusing on (I say probably because they're the ones with high bug counts in the data) are probably C and C++, which have other issues making them higher in bug count. C is hardly even typed. Both have manual memory management.

Also, there's no control for commit frequency. Some people put everything in one commit, while others commit every line change. The Rails Tutorial even recommends the latter.

Lastly, Scala and Haskell killed in this study, as far as raw numbers go. But it doesn't seem significant.

I'll stick with subjective evaluations for now. This is just too hard to measure.