If you have access to trade journal type archives (IEEE, ACM, etc) you can find a lot of articles/studies on pair programming. Most of those that I've seen tend

If you have access to trade journal type archives (IEEE, ACM, etc) you can find a lot of articles/studies on pair programming. Most of those that I've seen tend to be positive in their attitude toward pairing, though it's sometimes hard to tell if bias is at work there; also, many are in an academic setting environment rather than a corporate or startup/consulting environment, which may lead to some different results. If you're a student, or know one, it's very probable that your school's library might have online access to some of these journals. If you want statistics, that might be a good place to start.