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selection bias

   Also found in: Wikipedia 0.02 sec.
selection bias [si′lek·shən ‚bī·əs]
(statistics)
A bias built into an experiment by the method used to select the subjects which are to undergo treatment.


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Most studies of physical activity and obesity are usually limited by short follow-up periods and genetic selection bias, but here's a 30-year study of 16 twin pairs who were discordant for leisure time physical activity habits in 1975, and who remained so throughout the next 30 years.
Based on the probit model estimates, we compute the selection bias correction term [lambda] as: [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] where [[theta].
Contributors, who are US scholars of education, psychology, health and human services, public policy, and public administration, cover experimental and nonexperimental methods, including randomized controlled trials and the general elimination methodology, different approaches to gathering credible evidence, and ways to determine causation, selection bias, and other topics.
 
 
 
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