The Role of Random Allocation in Randomized Controlled Trials: Distinguishing Selection Bias from Baseline Imbalance Fives, Allyn Rusell, Daniel Russell, Daniel Kearns, Noreen Lyons, Rena Eaton, Patricia Canavan, John Devaney, Carmel O'Brien, Aoife
dc.contributor.department Human Development and Family Studies 2018-02-18T14:20:08.000 2020-06-30T04:06:28Z 2020-06-30T04:06:28Z Fri Jan 01 00:00:00 UTC 2016 2013-02-01
dc.description.abstract <p>Background: This paper addresses one threat to the internal validity of a randomized controlled trial (RCT), selection bias. Many authors argue that random allocation is used to ensure baseline equality between study conditions in a given study and that statistically significant differences at pretest mean that randomisation has failed.</p> <p>Purpose: The purpose of this study was to clarify the role of random allocation in an RCT study. Is the role of random allocation to protect against selection bias? And does it have a further role, namely to ensure baseline equality and the absence of statistically significant differences between study conditions at pretest?</p> <p>Setting: The participants for this study were 229 children in 1st and 2nd grade and data were collected as part of an RCT evaluation of a volunteer reading programme piloted in Ireland, Wizards of Words (WoW).</p>
dc.description.comments <p>This is an article from <em>Journal of MultiDisciplinary Evaluation</em>, 2013, 9(20); 33-42. Posted with permission. </p>
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dc.identifier.articleid 1049
dc.identifier.contextkey 10357527
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dc.identifier.submissionpath hdfs_pubs/50
dc.language.iso en
dc.source.bitstream archive/|||Sat Jan 15 00:41:13 UTC 2022
dc.subject.disciplines Family, Life Course, and Society
dc.subject.disciplines Medicine and Health
dc.subject.disciplines Regional Sociology
dc.subject.disciplines Social Psychology and Interaction
dc.title The Role of Random Allocation in Randomized Controlled Trials: Distinguishing Selection Bias from Baseline Imbalance
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dc.type.genre article
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