| Optimal sample sizes for Welch's test under various allocation and cost considerations. | |
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MedLine Citation:
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PMID: 21512873 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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The issue of the sample size necessary to ensure adequate statistical power has been the focus of considerableattention in scientific research. Conventional presentations of sample size determination do not consider budgetary and participant allocation scheme constraints, although there is some discussion in the literature. The introduction of additional allocation and cost concerns complicates study design, although the resulting procedure permits a practical treatment of sample size planning. This article presents exact techniques for optimizing sample size determinations in the context of Welch (Biometrika, 29, 350-362, 1938) test of the difference between two means under various design and cost considerations. The allocation schemes include cases in which (1) the ratio of group sizes is given and (2) one sample size is specified. The cost implications suggest optimally assigning subjects (1) to attain maximum power performance for a fixed cost and (2) to meet adesignated power level for the least cost. The proposed methods provide useful alternatives to the conventional procedures and can be readily implemented with the developed R and SAS programs that are available as supplemental materials from brm.psychonomic-journals.org/content/supplemental. |
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Authors:
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Show-Li Jan; Gwowen Shieh |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-4-22 |
Journal Detail:
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Title: Behavior research methods Volume: - ISSN: 1554-3528 ISO Abbreviation: - Publication Date: 2011 Apr |
Date Detail:
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Created Date: 2011-4-22 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101244316 Medline TA: Behav Res Methods Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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Department of Applied Mathematics, Chung Yuan Christian University, Chungli, Taiwan, 32023, Republic of China, sljan@math.cycu.edu.tw. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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