Apr 6, 2014
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BIAS

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A statistical term describing a systematic influence which leads to consistent over- or underestimation of the true value. For example, if a researcher is studying the effects of two different drugs on the same disease and personally favours one, unless they have been blinded to which patient is receiving which treatment, they may unwittingly cause bias in the results by regarding those treated with their preferred drug as being healthier.

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Medical Dictionary

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