I don't care how many "studies" are done, there is no direct correlation between success and graduating from an "accredited" aviation program.

One of my best friends at work is at his second major airline (by choice) and has nothing more than a high school diploma. If success is directly correlated to an aviation university, then how do you explain it when someone has no college, thousands of hours, multiple type ratings, and an income in excess of $150K/year as a first officer??