DOI
https://doi.org/10.25772/G4J1-W766
Author ORCID Identifier
0000-0002-0984-0909
Defense Date
2019
Document Type
Dissertation
Degree Name
Doctor of Philosophy
Department
Biostatistics
First Advisor
Roy T. Sabo
Second Advisor
Robert A. Perera
Third Advisor
Nitai Mukhopadhyay
Fourth Advisor
Alex Krist
Fifth Advisor
Leroy Thacker
Abstract
As researchers increasingly use web-based surveys, the ease of dropping out in the online setting is a growing issue in ensuring data quality. One theory is that dropout or attrition occurs in phases that can be generalized to phases of high dropout and phases of stable use. In order to detect these phases, several methods are explored. First, existing methods and user-specified thresholds are applied to survey data where significant changes in the dropout rate between two questions is interpreted as the start or end of a high dropout phase. Next, survey dropout is considered as a time-to-event outcome and tests within change-point hazard models are introduced. Performance of these change-point hazard models is compared. Finally, all methods are applied to survey data on patient cancer screening preferences, testing the null hypothesis of no phases of attrition (no change-points) against the alternative hypothesis that distinct attrition phases exist (at least one change-point).
Rights
© The Author
Is Part Of
VCU University Archives
Is Part Of
VCU Theses and Dissertations
Date of Submission
4-8-2019
Included in
Applied Statistics Commons, Biostatistics Commons, Design of Experiments and Sample Surveys Commons, Statistical Models Commons, Survival Analysis Commons