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Practical advice for creating fair comparison groups in observational study ...
Method Help
Biased comparison groups will invalidate observational research conclusions. Creating well‑matched comparison cohorts requires careful thought. What common pitfalls do you observe when researchers define comparison groups for observational analysis?
Joseph Davis, Jonathan Allen and 60 others4 Comments-
Clearly define inclusion and exclusion criteria for both target and comparison groups upfront.
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Avoid post‑hoc tweaking group boundaries after seeing outcome results.
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Document group‑matching procedure fully inside your study records.
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Test sensitivity of main findings against alternate comparison‑group definitions.
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