(7.May) The gold standard of sampling is random, where every unit has equal chance of selection, which allows us to do amazing things like predict elections with tiny samples of thousands. Sometimes, researchers use convenience samples — whomever they can find easily — and those can be okay, or not, depending on how typical the sample ends up being compared to the universe. Sometimes, in cases like this, the sampling affects behavior: people who self-identify their politics are almost certainly going to behave quite differently, on average, than people who do not, when it comes to the behavior in question which is sharing and clicking through ideologically challenging content.
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