This would be too heavily influenced by confounding factors. For instance: * Are the teams that use certain languages comprised of more experienced people? *

This would be too heavily influenced by confounding factors. For instance: * Are the teams that use certain languages comprised of more experienced people? * How mature is the company and project? I.e., a faster moving startup cutting more corners, where time was decided to be of the essence (rightly or wrongly) will likely produce more on call incidents than a slower, more established company that can takes its time