Bias or Systematic Error
What Is Bias?
Systematic error is also known as bias. It is any systematic process in the conduct of a study that results in the incorrect estimate of a measure of disease occurrence or measure of association. Because it is a systematic process, it will cause a distortion from the truth in a predictable (not random) direction. We say that the amount of systematic error is captured in the
validity of the inference.

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Bias (statistics) . The list of authors can be viewed on the
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