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ERIC Number: EJ1033114
Record Type: Journal
Publication Date: 2014-Aug
Pages: 25
Abstractor: As Provided
Reference Count: 17
ISSN: ISSN-1076-9986
Conditional Optimal Design in Three- and Four-Level Experiments
Hedges, Larry V.; Borenstein, Michael
Journal of Educational and Behavioral Statistics, v39 n4 p257-281 Aug 2014
The precision of estimates of treatment effects in multilevel experiments depends on the sample sizes chosen at each level. It is often desirable to choose sample sizes at each level to obtain the smallest variance for a fixed total cost, that is, to obtain optimal sample allocation. This article extends previous results on optimal allocation to four-level cluster randomized designs and randomized block designs. It also introduces the idea of constrained optimal allocation, where the sample size at one or more levels is fixed by considerations other than cost or sampling variation. Explicit formulas are given for constrained optimal allocation in three- and four-level designs.
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Publication Type: Journal Articles; Reports - Research
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A