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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 Sampling

Methodological Alternatives and Supplements to Random Sampling

(p.20) 2 Methodological Alternatives and Supplements to Random Sampling
Strategies to Approximate Random Sampling and Assignment

Patrick Dattalo

Oxford University Press

This chapter begins with a discussion of external validity and sampling bias. Next, the rationale and limitations of RS as a way to maximize external validity and minimize sampling bias are presented. Then, the following alternatives and supplements to RS will be presented in terms of their assumptions, implementations, strengths, and weaknesses: (1) deliberate sampling for diversity and typicalness; and (2) sequential sampling. Deliberate sampling for diversity and typicalness and sequential sampling are methodological alternatives for RS.

Keywords:   random, selection bias, deliberate sampling for diversity, deliberate sampling for typical instances, sequential sampling, fixed sample design, type I error, power, stopping rule, interim looks, Pocock method, O'Brien-Fleming method, alpha spending function

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