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selection bias
Selection bias is the selection of individuals, groups or data for analysis in such a way that proper randomization is not achieved, thereby ensuring that the sample obtained is not representative of the population intended to be analyzed.〔(Dictionary of Cancer Terms → selection bias ). Retrieved on September 23, 2009.〕 It is sometimes referred to as the selection effect. The phrase "selection bias" most often refers to the distortion of a statistical analysis, resulting from the method of collecting samples. If the selection bias is not taken into account, then some conclusions of the study may not be accurate.
==Types==
There are many types of possible selection bias, including:
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