ok i get these comments ON THE REGULAR and here is an angry tweet thread about why they are wrong and should feel bad 1. ppl are always like, 'but selection bias tho.' Do you know what selection bias is, how it works, and why it's bad?https://twitter.com/_giovannimattei/status/1437462754949017604 …
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Selection bias is when you get misleading effects or conclusions or whatever due to how you selected the ppl you're asking about. As in, if you're measuring how nice ppl are and then ask ppl to volunteer for your study, you'll only be measuring ppl nice enough to volunteer.
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Replying to @Aella_Girl
There is also the issue of systematic non-response which contributes to selection bias. You can’t rule out what you don’t observe.
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Replying to @Aella_Girl
If you can’t rule out the possibility of non-response bias caused by unobserved characteristics then your interpretation of the results should be within the confines of “those who are likely to respond to my survey” and not their reported demographics.
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i only hope you apply this level of evenhanded critique to all studies ever done with voluntary respondents (but also whenever i do bigger surveys i try to be careful to remove incentives for nonresponse that might be related to the thing im trying to test)
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