3 ms·

I always wonder if there is a circular logic flaw in survey studies of recreation and dementia: could it be that the folks who are chasing Viagra or running mar

I always wonder if there is a circular logic flaw in survey studies of recreation and dementia: could it be that the folks who are chasing Viagra or running marathons don't get dementia, because the ones with dementia don't pursue these activities?

acchow 2y ago
This is known as a confounding bias. A quality study should try to eliminate the obvious ones, but of course there may still he an infinite number of hidden confounding variables.
loeg 2y ago
This isn't a survey; it's an RCT.