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Simulation Study on the Performance of the Simple Difference and Covariance Adjusted Scores in Randomized Experimental Designs

Title: A Simulation Study on the Performance of the Simple Difference and Covariance Adjusted Scores in Randomized Experimental Designs.
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Name(s): Petscher, Yaacov M., author
Schatschneider, Christopher, professor directing dissertation
Kamata, Akihito, outside committee member
Wagner, Richard K., committee member
Maner, Jon, committee member
Kim, Young-Suk, committee member
Department of Psychology, degree granting department
Florida State University, degree granting institution
Type of Resource: text
Genre: Text
Issuance: monographic
Date Issued: 2009
Publisher: Florida State University
Place of Publication: Tallahassee, Florida
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: A Monte Carlo simulation was conducted to examine the conditions under which the simple difference and residualized change scores were more or less powerful than each other, and if the two estimators produced a biased estimate of the average treatment effect. Five factors were manipulated in the design including: sample size, normality of the pretest and posttest distributions, average treatment effect, the correlation between pretest and posttest, and posttest variance. A 5 x 5 x 3 x 4 x 4 mostly-crossed design was run with 1,000 replications per condition, resulting in 905,000 conditions. Results suggested that the covariance adjusted score in an ANCOVA designed should be used in pretest-posttest randomized experiments when power is of interest. Additionally, neither estimator produced a biased estimate of the average treatment.
Identifier: FSU_migr_etd-1975 (IID)
Submitted Note: A Dissertation submitted to the Department of Psychology in partial fulfillment of the requirements for the degree of Doctor of Philosophy.
Degree Awarded: Spring Semester, 2009.
Date of Defense: November 14, 2008.
Keywords: Monte Carlo, Randomized Experiment, Gain Score
Bibliography Note: Includes bibliographical references.
Advisory Committee: Christopher Schatschneider, Professor Directing Dissertation; Akihito Kamata, Outside Committee Member; Richard K. Wagner, Committee Member; Jon Maner, Committee Member; Young-Suk Kim, Committee Member.
Subject(s): Psychology
Persistent Link to This Record: http://purl.flvc.org/fsu/fd/FSU_migr_etd-1975
Owner Institution: FSU

Choose the citation style.
Petscher, Y. M. (2009). A Simulation Study on the Performance of the Simple Difference and Covariance Adjusted Scores in Randomized Experimental Designs. Retrieved from http://purl.flvc.org/fsu/fd/FSU_migr_etd-1975