Quote:
Originally Posted by mikeod
One possible reason would be to collect as much data on as many topics as possible without making a single survey unbearably long. In my experience, long surveys, either in time needed or detail, don't yield enough responses to be valid.
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The NIH AARP Diet And Health Study was a much much longer (more detailed) survey and managed to yield 500,000 study participants. I'm one of them and the study, that started in 1995, is still ongoing. Many conclusions have been already been made and published in a scientific journal.
