A comparison of smoothing methods for the common item nonequivalent groups design
نویسندگان
چکیده
has been approved by the Examining Committee for the thesis requirement for the Doctor of Philosophy degree in Psychological and Quantitative Foundations (Educational Measurement and Statistics) at the August 2014 graduation. ii ACKNOWLEDGMENTS Looking back, once again I realize that I am surrounded by some great people, the people that I love and trust. The whole process of writing this dissertation and completing the graduate program could not have been done without the enormous support I got from them. I would like to extend my sincere gratitude to my committee chairs, Dr. Walter Vispoel and Dr. Won-Chan Lee. Dr. Walter Vispoel has been a wonderful mentor, advisor, and supervisor for the six years I have spent in Iowa. He has gently guided me into the world of academia, and he has been a consistent source of moral support throughout the years. I cannot thank him enough for his efforts and consideration, especially as a dissertation committee co-chair. If this dissertation succeeds in communicating what I have discovered to other researchers and practitioners, Dr. Vispoel deserves some credit for this clarity. Dr. Won-Chan Lee also deserves my deepest appreciation for " pushing " me to think more deeply about the issues dealt with in this dissertation. He showed endless patience with me and strong belief in my project, so that I could move forward even when I felt down and lost. Kathryn Cowles for serving as my committee members. Dr. Robert Brennan has provided numerous constructive feedbacks on numerous occasions to better the arguments made in this dissertation, and he has supported me through the process of searching for my first job. Dr. Catherine Welch has helped me think about the issue of smoothing with the practitioner's perspective, and also lifted my spirit up with her smile every time we bumped into each other. Dr. Mary Kathryn Cowles has given me the greatest tool, R, to make this dissertation happen. I would also like to express my gratitude to my friends, especially the ones who have always been there for me from the beginning of this journey—Eunjung Lee (Miss iii you!), thankful to the HPY members and " birthday party members " for the precious feedback on my research ideas and the moral support. I would also like to thank the people who were concerned for my wellbeing throughout the writing process. My family deserves a significant amount of the credit …
منابع مشابه
Effectiveness of the hybrid Levine equipercentile and modified frequency estimation equating methods under the common-item nonequivalent groups design
The purpose of this study was to evaluate the effectiveness of the hybrid Levine equipercentile (Hybrid LE) and modified frequency estimation (MFE) equating methods in improving accuracy of equating as compared to the percentile rank frequency estimation (FE), kernel frequency estimation (Kernel FE) and percentile rank chained equipercentile (CE) equating methods under the common-item nonequiva...
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In equating, when common items are internal and scoring is in terms of the number of correct items, some pairs of total scores (X) and common-item scores (V ) can never be observed in a bivariate distribution of X and V ; these pairs are called structural zeros (Bishop, Fienberg, & Holland, 2007; Holland & Wang, 1987). This study examines how different approaches to handling structural zeros gi...
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As part of its nonprofit mission, ETS conducts and disseminates the results of research to advance quality and equity in education and assessment for the benefit of ETS's constituents and the field. To obtain a PDF or a print copy of a report, please visit: Abstract The nonequivalent groups with anchor test (NEAT) design involves missing data that are missing by design. Three popular equating m...
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