Selection bias

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Selection bias occurs when ones sample is not representative of the population, leading to skewed or biased results. May arise from n

A political prediction based on anecdotal sampling of the members of a Golf Club (or for that matter a Working Men’s Club) — who are likely to share political opinions — suffers from selection bias.

Non-random sampling methods, exclusion of certain groups, or self-selection by participants.

See also

• Lucy Letby
• Confirmation bias
• Survivorship bias