There are some well documented stories of non-pilots successfully landing airplanes after the pilot was incapacitated. Usually this involves radio assistance by ATC and/or flight instructors.
My question is whether there is any statistical data available about the success rate of such landings. I would judge success by the lives saved by the landing attempt.
I am aware that the term "non-pilot" is somewhat vague, in that it could refer to anything from a complete novice to a student pilot or even a GA pilot trying to land a commercial jet. Any kind of statistical data involving people punching above their weight trying to land an airplane in an emergency would qualify as an answer.