An interesting point is the correlation of touchdown positon with a limiting runway (seen in other data) – why do pilots touchdown earlier, yet on longer runways they do not; cue the psychologists.
Psychologists?? It's pretty obvious to any even inexperienced driver: on a short runway you touch down earlier/harder so you don't run off the end! Long runways, you won't run off the end so no need to be quite as anal about the touchdown.
