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Strategies to Approximate Random Sampling and Assignment$
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Patrick Dattalo

Print publication date: 2009

Print ISBN-13: 9780195378351

Published to Oxford Scholarship Online: February 2010

DOI: 10.1093/acprof:oso/9780195378351.001.0001

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Methodological Alternatives and Supplements to Random Assignment

Methodological Alternatives and Supplements to Random Assignment

(p.93) 4 Methodological Alternatives and Supplements to Random Assignment
Strategies to Approximate Random Sampling and Assignment

Patrick Dattalo

Oxford University Press

This chapter begins with a discussion of internal validity and assignment bias. Next, the rationale for, and the limitations of, RA as a way to maximize internal validity and minimize assignment are presented. Finally, the following alternatives to RA are [n2]delineated in terms of their assumptions, implementations, strengths, and weaknesses: (1) sequential assignment and treatment-as-usual combined; and (2) partially randomized preference trials. Sequential assignment and treatment-as-usual combined and partially randomized preference trials are methodological alternatives for RA.

Keywords:   internal validity, selection bias, direct control, random assignment, comparison groups, treatment-as-usual, sequential assignment, clinical equipoise, partially randomized preference trial

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