• ImplyingImplications@lemmy.ca
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    1 year ago

    These types of studies are basically all examples of selection bias. The same sort of study shows “people in city centres walk faster than people in the country side”. There’s no correction for who is walking, just where they’re walking or ĥow they walk.

    When studies properly control variables it just ends up being “Young people walk faster than old people” or, in the case of this study, “Young people are more depressed than old people”.