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unbiased

unbiased In research methods, unbiased means free from a systematic tendency to favor some outcomes over others.

In research methods, unbiased means free from a systematic tendency to favor some outcomes over others. A sample is unbiased when each member of the population has the same chance of selection, and an estimator is unbiased when it does not consistently overestimate or underestimate the value it is meant to estimate.

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Sources

Drafting source: Online Statistics Education, version 2 (David M. Lane, project leader). Version 2; publisher statement snapshot 2026-10-18; SHA-256 0dcad9ee85f61f9e2bb24d26279de155ac749164ea4da2a3bffeabcf9ea471a6. “Unbiased” (unbiased.html).
public-domain-US · Definition uses new wording; original source retains its stated licence. · Source snapshot SHA-256: a402d596bdbb4cde44e82b261ac4d597fa67955c0e859d5905c90b208003d8ae

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PsychTerms (psychterms.org), CC BY 4.0, version 1. “unbiased.” Development preview.

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