Problems of the randomization test for AB designs

N = 1 designs imply repeated registrations of the behaviour of the same experimental unit and the measurements obtained are often few due to time limitations, while they are also likely to be sequentially dependent. The analytical techniques needed to enhance statistical and clinical decision making...

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Bibliographic Details
Published inPsicológica (Valencia) Vol. 30; no. 1; pp. 137 - 149
Main Authors Manolov, Rumen, Solanas Pérez, Antonio
Format Journal Article
LanguageEnglish
Published Universitat de València 2009
University of Valencia
Subjects
Data Analysis
Dependence (Statistics)
Dependència (Estadística)
Investigació de cas únic
Mètodes estadístics
Psychological Studies
Research Design
Simulation
Single subject research
Statistical methods
Statistics
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ISSN0211-2159

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Summary:N = 1 designs imply repeated registrations of the behaviour of the same experimental unit and the measurements obtained are often few due to time limitations, while they are also likely to be sequentially dependent. The analytical techniques needed to enhance statistical and clinical decision making have to deal with these problems. Different procedures for analysing data from single-case AB designs are discussed, presenting their main features and revising the results reported by previous studies. Randomization tests represent one of the statistical methods that seemed to perform well in terms of controlling false alarm rates. In the experimental part of the study a new simulation approach is used to test the performance of randomization tests and the results suggest that the technique is not always robust against the violation of the independence assumption. Moreover, sensitivity proved to be generally unacceptably low for series lengths equal to 30 and 40. Considering the evidence available, there does not seem to be an optimal technique for single-case data analysis
ISSN:0211-2159