Selection Bias

**Definition:** The introduction of error due to systematic differences in the characteristics between those selected and those not selected for a given study. In sampling bias, error is the result of failure to ensure that all members of the reference population have a known chance of selection in the sample.

**Tree numbers:** - N05.715.350.150.775 - N06.850.490.500.500

**Synonyms:** - Bias, Selection - Selection Biases