偏差。
Bias.
作者信息
Delgado-Rodríguez Miguel, Llorca Javier
机构信息
Division of Preventive Medicine and Public Health, University of Jaen, Spain.
出版信息
J Epidemiol Community Health. 2004 Aug;58(8):635-41. doi: 10.1136/jech.2003.008466.
Abstract
The concept of bias is the lack of internal validity or incorrect assessment of the association between an exposure and an effect in the target population in which the statistic estimated has an expectation that does not equal the true value. Biases can be classified by the research stage in which they occur or by the direction of change in a estimate. The most important biases are those produced in the definition and selection of the study population, data collection, and the association between different determinants of an effect in the population. A definition of the most common biases occurring in these stages is given.
摘要
偏倚的概念是缺乏内部效度，或者是对目标人群中暴露与效应之间关联的评估不正确，在该目标人群中，所估计的统计量的期望值不等于真实值。偏倚可根据其发生的研究阶段或估计值变化的方向进行分类。最重要的偏倚是在研究人群的定义和选择、数据收集以及人群中效应的不同决定因素之间的关联过程中产生的偏倚。本文给出了这些阶段中最常见偏倚的定义。
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