I saw a talk from Andrew Ng a couple of weeks ago where he was asked about the low retention rate. He countered that 40% of people who submit the first homework

I saw a talk from Andrew Ng a couple of weeks ago where he was asked about the low retention rate. He countered that 40% of people who submit the first homework actually complete the class. I would say that is pretty great retention rate. Personally, I've signed up for dozens of Coursera courses but I've only completed one (Game Theory). It's not necessarily that the other courses were lacking the ability to keep me enrolled, but rather I never planned to try at them. I sign up to most classes to see the videos and get surface-level understanding of a subject.