这个词是什么意思？
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.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D015983 · MeSH 2026。
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