One thing that bothers me is when ppl critique my data as "unscientific" due to sampling bias. First, y'all better not look into a lot of what you think are "scientific" studies Second, there's nothing wrong with sampling bias if you acknowledge limitations and don't extrapolate.
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The difference is that the bias of paid surveys is well understood - it excludes rich people, yes. Also many studies are done on college students, and it is a somewhat well-understood and meaningful demographic. If you use internet volunteers, however, you don't understand the
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sample bias you have. It can be anything. It can be arbitrary bad. For example, suppose you ask about attitude towards kinks on a kink forum. The answers might give you no information whatsoever on the attitude toward kinks within the general population.
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