Document Detail


Power comparison of robust approximate and non-parametric tests for the analysis of cross-over trials.
MedLine Citation:
PMID:  11304735     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The main advantage of cross-over designs in practice is the use of a smaller number of subjects to produce treatment comparisons with sufficient precision. Bellavance and Tardif proposed a non-parametric approach to test the hypotheses of direct treatment and carry-over effects for the three-treatment three-period and six sequences cross-over design and showed the high asymptotic efficiency of their approach relative to the classical F-test based on ordinary least squares (OLS). In a more recent paper, Ohrvik suggested another non-parametric method for the analysis of cross-over trials. The power of these two non-parametric approaches is evaluated for small sample sizes via simulations, and compared to the power of the usual analysis of variance model based on OLS and a modified F-test approximation that take into account the correlation structure of the repeated measurements within subjects. Different covariance structures, sample sizes, and probability distributions for the responses, namely normal and gamma, are used in the simulations to evaluate the power and robustness of these different methods of analysis.
Authors:
J A Correa; F Bellavance
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Statistics in medicine     Volume:  20     ISSN:  0277-6715     ISO Abbreviation:  Stat Med     Publication Date:  2001 Apr 
Date Detail:
Created Date:  2001-04-17     Completed Date:  2001-07-12     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  8215016     Medline TA:  Stat Med     Country:  England    
Other Details:
Languages:  eng     Pagination:  1185-96     Citation Subset:  IM    
Copyright Information:
Copyright 2001 John Wiley & Sons, Ltd.
Affiliation:
Department of Mathematical Sciences, Florida Atlantic University, 777 Glades Road, P.O. Box 3091, Boca Raton, FL 33431, USA. jcorrea@fau.edu
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MeSH Terms
Descriptor/Qualifier:
Analysis of Variance
Cross-Over Studies*
Humans
Least-Squares Analysis
Models, Statistical
Monte Carlo Method
Probability
Randomized Controlled Trials as Topic / statistics & numerical data*
Sample Size
Comments/Corrections
Comment In:
Stat Med. 2002 Jul 15;21(13):1955-6; author reply 1956-8   [PMID:  12111899 ]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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