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  "retrievedAt": "2026-07-16T18:21:28.358Z",
  "createdAt": "2026-05-04T19:28:31.752Z",
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    "text": "Large sample size does not address selection bias; volunteer samples may systematically differ from non-volunteers in ways that affect treatment response."
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      "text": "Volunteer participants in platform experiments self-select based on willingness to modify their social media behavior, which may correlate with lower susceptibility to algorithmic influence.",
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