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ERIC Number: EJ872078
Record Type: Journal
Publication Date: 2010
Pages: 24
Abstractor: As Provided
Reference Count: 40
ISSN: ISSN-0022-0973
Data-Division-Specific Robustness and Power of Randomization Tests for ABAB Designs
Manolov, Rumen; Solanas, Antonio; Bulte, Isis; Onghena, Patrick
Journal of Experimental Education, v78 n2 p191-214 2010
This study deals with the statistical properties of a randomization test applied to an ABAB design in cases where the desirable random assignment of the points of change in phase is not possible. To obtain information about each possible data division, the authors carried out a conditional Monte Carlo simulation with 100,000 samples for each systematically chosen triplet. The authors studied robustness and power under several experimental conditions--different autocorrelation levels and different effect sizes as well as different phase lengths determined by the points of change. Type I error rates were distorted by the presence of autocorrelation for the majority of data divisions. The authors obtained satisfactory Type II error rates only for large treatment effects. The relation between the lengths of the four phases appeared to be an important factor for the robustness and power of the randomization test. (Contains 9 tables.)
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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