122 Selection Bias
A bias in the way evidence is collected that distorts analysis and conclusions.
• Selection bias results from the non-random sampling of evidence. Accordingly, it over-represents certain aspects of the evidence and under-represents others, distorting analysis and conclusions.
• For example, if subscribers of a science magazine are surveyed and their responses generalized to the overall population, science-minded viewpoints would be over-represented in the analysis and results.
• Avoid selection bias. Collect data from entire populations when they are small. Randomly sample from populations when they are large.
• Scrutinize the selected population and sampling methods when evaluating conclusions based on statistical analysis. ...
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