unbiased

Meanings

1. 1
   adj

   not favoring one person, group, position, or outcome unfairly; impartial

   The panel asked an unbiased expert to assess the evidence.

2. 2
   adj

   statistics: having an expected value equal to the true value of the quantity being estimated

   The sample mean is an unbiased estimator of the population mean.

Formed from un-, 'not,' + biased, the past-participial adjective of bias. The statistical sense developed from the broader idea of freedom from systematic preference or distortion. Unbiassed is a historical spelling with doubled s.

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