ERIC Number: EJ1039722
Record Type: Journal
Publication Date: 2014-Sep
Abstractor: As Provided
Reference Count: 23
Optimal Assignment Methods in Three-Form Planned Missing Data Designs for Longitudinal Panel Studies
Jorgensen, Terrence D.; Rhemtulla, Mijke; Schoemann, Alexander; McPherson, Brent; Wu, Wei; Little, Todd D.
International Journal of Behavioral Development, v38 n5 p397-410 Sep 2014
Planned missing designs are becoming increasingly popular, but because there is no consensus on how to implement them in longitudinal research, we simulated longitudinal data to distinguish between strategies of assigning items to forms and of assigning forms to participants across measurement occasions. Using relative efficiency as the criterion, results indicate that balanced item assignment coupled with assigning different forms over time most often yields the optimal assignment method, but only if variables are reliable. We also address how practice effects can bias latent means. A second simulation demonstrates that (a) assigning different forms over time diminishes practice effects and (b) using planned-missing-data patterns as predictors of practice can remove bias altogether.
Descriptors: Longitudinal Studies, Research Design, Data Analysis, Monte Carlo Methods, Measurement, Computation, Regression (Statistics), Efficiency, Statistical Bias
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Publication Type: Journal Articles; Reports - Research
Education Level: N/A
Sponsor: National Science Foundation
Authoring Institution: N/A
Grant or Contract Numbers: NSF 1053160