Download Same Author and Same Data Dependence in Meta Analysis PDF

Same Author and Same Data Dependence in Meta Analysis
Name: Same Author and Same Data Dependence in Meta Analysis
Pages: 175
Year: 2015
Language: English
File Size: 5.06 MB
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ivACKNOWLEDGEMENTS When I came to FSU in 2002 for the government officer training program, my goal was to learn educational methodology and enjoy my life for the first time in my life before going back to Korea two years later. However, with Dr. Kamata's help, I dared to start my doctoral program. He helped me find a graduate assistant job in the summer of 2004 and a full time job at the Florida Department of Education as a psychometrician in the summer of 2006. His kindness and help were what made me start to my doctoral program, and he always helped me get the tuition waiver that I needed for my doctoral program. Dr. Becker came to FSU from MSU in the fall of 2004. I asked her permission to attend her SynRG meeting, and she gave me tutoring on meta analysis every Friday. Her passion for teaching and expertise in meta analysis has left a deep impression on me. I started my doctoral program with Dr. Kamata's help, and I started my dissertation with Dr. Becker's guidance. As an advisor, faculty member, and researcher, she is a great role model. To me, she always tackles the issues of impossible missions. However, whenever she tackles the 'mission impossible', she makes it a possible one. She is a magician to me. Since the fall of 2006, I have followed her guidance. She is my light house in the dark when I have lost my way. She is a friend who encourages me, an advisor who gives me outlines to study, and a researcher who finds a methodology when I am stuck in statistical issues. She is a queen and emperess of editing, while I am a beggar of writing and the APA style. I should acknowledge that I could not finish this dissertation without the help and guidance of Dr. Becker. I attended Dr. Huffer's Stat classes in 2005 and 2006, and he is always nice to his students. When I asked for help with my simulation in the summer of 2008, he was so generous and kind to help me with the R code for my study. Frankly speaking, the same data and same author situation are really difficult issues when generating data. However, his expertise made it possible to simulate this data, and whenever I asked for his help, he always spent almost all afternoon working with me, and he did this from the summer of 2008 to the spring of 2009.


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vDr. Yang is always positive and gave a good insight on statistical issues for my dissertation. She is an expert on SEM, and her lectures made me understand the statistical issues more thoroughly. Before Dr. Yang came to FSU in 2007, I took most of my statistical courses from Dr. Tate. I express my thanks to both of them for their wisdom and guidance. I also want to express my thanks to my FDOE friends (Florida Department of Education). Salih is the leader of our psychometric team, and he understands and helps me in the horrible situation of having to work during the day while studying at night and on weekends. Hiro is a really responsible guy who helped me a lot during difficult psychometric issues. He is a hero to our entire team. Eddy is a nice guy who is always smiling and welcoming while he works. He is always available to help me whenever I ask for his assistance. Harlon is super man to the team. He really works hard and is a multi tasking guy. Thank you, my FDOE friends and team! I have worked at the FDOE since the fall of 2006, and I can't imagine my life without their help. I also express my thanks to Eileen, Betty, Jackie (Director), Alana (TDC secretary), Vince (TDC director), Kris and Victoria (Bureau chiefs), and to Cornelia (Administrator). It was a wonderful experience for me, and I learned a lot about psychometrics. I can now finish my dissertation with the help and understanding I attained from all of my fellow FDOE staff members. Before my work at the FDOE, my parents in law helped me financially. My mother in law visited us three times (in the winter of 2002, the summer of 2004, and the spring of 2005). She, like Dr. Kamata, encouraged me to begin my doctoral program, and she gave my family the financial help to do it. Without her and my father in law's help, I could not have started my doctoral program and would not be where I am today. My mother in law died of cancer in October of 2007. She is missed. My father also died in April of 2007. I ended up visiting Korea three times in 2007. That was the hardest time in my life. At that time, I tried to give up my studies and go back to Korea because my mother's health was also suffering. I must admit that life was meaningless to me. However, I have a son, Hee yoon, born in January of 2005, and a daughter, Da won, born in February of 2001. Da Won and Hee yoon made me happy


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viwhenever I was tired with my studies. My children are my hope and source of energy. Their smiles make me forget my difficulties and hardships. Three women in my life were instrumental in making me complete this study. The first one is my mother. She always sacrifices her life for us, and she cannot sleep well because she is always working for her family. Her efforts make me determined not to give up on my work and studies regardless of difficulties and obstacles in my life. She did not give verbal lessons to me, but her life is a lesson in and of itself for me. I just want to do something great, especially in the field of education, as she did something great for my family. I want to make her happy when I go back to Korea. The second woman who was instrumental in helping me is my wife. Her nickname was Angel to my college friends, and she is a real angel to me as a wife and friend. I am a foolish guy, but she always expresses her respect to the idiot guy that I am. Whenever I made mistakes, she understood and helped me restart my work and research. I always talk to my friends; only my wife can live with me. The third woman is Dr. Becker. She is the ideal of an advisor, since I cannot imagine a better one in the world. I am a really lucky guy to have met these three women in my life. Thank you, my mother, my wife, and Dr. Becker.


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viiTABLE OF CONTENTS LIST OF TABLES...................................................................................ix LIST OF FIGURES..................................................................................x ABSTRACT....................................................................................... ..xi CHAPTER I: INTRODUCTION........................................................................................ 1 RESEARCH QUESTIONS.................................................................................................... 4 PURPOSE OF THIS STUDY.................................................................................................. 4 CHAPTER II: LITERATURE REVIEW........................................................................... 6 PREVALENCE OF AND WAY OF DEALING WITH 'SAME AUTHOR' AND 'SAME DATA' PAPERS6 1. Same author issue ................................................................................................... 6 2. Same data issue..................................................................................................... 10 1) Choosing one study among nested studies....................................................... 12 2) Average or weighted average for multiple outcome. ....................................... 13 3) Shiting unit of analysis in a meta analysis....................................................... 14 4) Sensitivity analysis........................................................................................... 15 JOURNAL EDITOR'S CRITERIA FOR ACCEPTING THE 'SAME AUTHOR' AND 'SAME DATA' STUDIES ......................................................................................................................... 17 TWO CASE STUDIES: 'SAME AUTHOR' STUDIES AND 'SAME DATA' SET STUDIES............... 21 Study 1: 'Same data' case study (Tennessee STAR class size project)..................... 21 Study 2: 'Same author' studies (Steel 2007 meta analysis)....................................... 24 CHAPTER III: METHODOLOGY.................................................................................. 26 HOMOGENEITY TEST...................................................................................................... 27 1. Homogeneity test in meta analysis....................................................................... 27


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viii2. Homogeneity test as an index of relatedness of 'same author' studies and 'same data' studies............................................................................................................... 28 3. Quantification of heterogeneity............................................................................ 31 FIXED EFFECTS CATEGORICAL ANALYSIS....................................................................... 33 INTRACLASS CORRELATION............................................................................................ 35 Correlation and ICC.................................................................................................. 35 SENSITIVITY ANALYSIS.................................................................................................. 41 HLM.............................................................................................................................. 44 1. Advantage of meta analysis using HLM .............................................................. 44 2. Nested structure in meta analysis......................................................................... 44 3. Nested structure and homogeneity........................................................................ 45 4. Same author/data characteristics: nested and unbalanced .................................... 45 5. Dependence in meta analysis................................................................................ 46 6. Function of HLM in meta analysis....................................................................... 48 7. HLM analysis procedure in meta analysis............................................................ 49 1) Within study model.......................................................................................... 50 2) Between study model....................................................................................... 50 8. Strength of HLM in meta analysis: Intraclass correlation, and 'variance explained statistics"................................................................................................................... 51 CHAPTER IV: SIMULATION........................................................................................ 53 INTRODUCTION.............................................................................................................. 53 'SAME DATA' ISSUE..................................................................................................... ...54 Examination of proposed statistical methods ........................................................... 56 Results....................................................................................................................... 56 'SAME AUTHOR' ISSUE.................................................................................................... 71 Examination of proposed statistical methods ........................................................... 75 Results....................................................................................................................... 77 SUMMARY...................................................................................................................... 86 LIMITATION................................................................................................................... 86


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ix CHAPTER V: EMPIRICAL ANALYSIS USING TWO EXAMPLE META ANALYSES...................................................................................................................... 87 CLASS SIZE META ANALYSIS AS AN EXAMPLE OF THE 'SAME DATA' ISSUE..................... 88 ESL META ANALYSIS AS AN EXAMPLE OF THE 'SAME AUTHOR' ISSUE............................ 99 CHAPTER VI: CONCLUSION AND DISCUSSION................................................... 110 WHAT I HAVE LEARNED............................................................................................... 110 PRACTICAL IMPLICATIONS........................................................................................... 112 LIMITATION................................................................................................................. 113 FUTURE RESEARCH...................................................................................................... 114 APPENDIX A: PREVALENCE OF META ANALYSIS USING SAME AUTHRO STUDIES........................................................................................................................ 116 APPENDIX B: FREQUENCIES OF SAME AUTHORS IN META ANALYSIS....... 117 APPENDIX C: THE LIST OF CLASS SIZE PAPERS IN THE DATA GATHERING STAGES ......................................................................................................................... 119 APPENDIX D: LIST OF 16 STUDIES IN ANALYSIS STAGE FOR META ANALYSI S OF CLASS SIZE STUDIES........................................................................................ 126 APPENDIX E: CHARACTERISTICS OF 8 STAR CLASS SIZE STUDIES IN 16 STUDIES IN ANALYSIS STAGE................................................................................ 128 APPENDIX F: REVIEW OF 26 'SAME AUTHOR' PAPERS IN META ANALYSIS130 APPENDIX G: LIST OF 17 STUDIES IN ANALYSIS STAGE FOR META ANALYSIS OF ELL STUDIES..................................................................................... 131 APPENDIX H: R CODE FOR 'SAME DATA' ISSUE.................................................. 132 APPENDIX I: R CODE FOR 'SAME AUTHOR' ISSUE.............................................. 136


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