Re: sampling in FB study. Authors could have inferred political ideology to study larger pop. Then be criticized for accuracy of inference.
@seanjtaylor By the way, FB already inferms political ideology, as you know. It's in the "why you see this ad" section for most folks.
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@zeynep Any inference based on activity is causally downstream from filtering mechanism. Could confound measurement. -
@seanjtaylor I've zero dispute that this is the thorniest of issues to study. Causal inference is hard. It's all coupled.
End of conversation
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