TWO-METHOD PLANNED MISSING DESIGNS FOR LONGITUDINAL RESEARCH
Issue Date
2013-12-31Author
Garnier-Villarreal, Mauricio
Publisher
University of Kansas
Format
49 pages
Type
Thesis
Degree Level
M.A.
Discipline
Psychology
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This item is protected by copyright and unless otherwise specified the copyright of this thesis/dissertation is held by the author.
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Show full item recordAbstract
We examine longitudinal extensions of the two-method measurement design, which uses planned missingness to optimize cost-efficiency and validity of hard-to-measure constructs. These designs use a combination of two measures: a "gold standard" that is highly valid but expensive to administer, and an inexpensive (e.g., survey-based) measure that contains systematic measurement bias (e.g., response bias). Using simulated data on 4 measurement occasions, we compared the cost-efficiency and validity of longitudinal designs where the gold standard is measured at one or more measurement occasions. We manipulated the nature of the response bias over time (constant, increasing, fluctuating), the factorial structure of the response bias over time, and the constraints placed on the latent variable model. Our results showed that parameter bias is lowest when the gold standard is measured on at least two occasions. When a multifactorial structure was used to model response bias over time, estimation difficulties were common. Almost all parameters in all conditions displayed high relative efficiency, suggesting that the 2-method design is an effective way to reduce costs and improve power and accuracy in longitudinal research.
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- Psychology Dissertations and Theses [459]
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