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Suggested Citation:"APPENDIXES." National Research Council. 1990. On Time to the Doctorate: A Study of the Lengthening Time to Completion for Doctorates in Science and Engineering. Washington, DC: The National Academies Press. doi: 10.17226/1401.
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Page 113
Suggested Citation:"APPENDIXES." National Research Council. 1990. On Time to the Doctorate: A Study of the Lengthening Time to Completion for Doctorates in Science and Engineering. Washington, DC: The National Academies Press. doi: 10.17226/1401.
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Page 114

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APPENDIXES A: RELATED TABLES Median Time to Me Doctorate Mean Total Time To the Doctorate (KID), 1967 and 1986 2.2 Mean Time Prior to Graduate Entrance (~GE), 1967 and 1986 2.3 Mean Registered Time to Be Doctorate (RTD), 1967 and 1986 2.4 Mean Time Not Enrolled in University (INEU), 1967 and 1986 2.5 Mean Total Years Change, 1967 and 1986 3 Estimated Personnel Loss, by Field, 1967 to 1986 4 Descriptive Statistics of Variables in die Data Base, by Field, 1967 to 1986 Linear Common Variables Model, Mean ~ IL) Log Common Variables Model, Mean 't 1 ~ s 5.1 5.2 Unique Variables Model, Mean 1 ID 6 Linear Common Variables Model, Mean RTD 6.1 Log Common Variables Model, Mean RTD 6.2 Unique Variables Model, Mean RTD 7 Linear Common Variables Model, Mean TPGE 7.1 Log Common Variables Model, Mean TPGE 8 Linear Common Variables Model, Mean TNEU 8.1 Log Common Variables Model, Mean INEU B: LIST OF ACRONYMS 113 115 116 116 117 117 118 119 130 154 156 158 160 162 164 166 168 170 172 175

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A need exists for better models of what contributes to changes in the time that students take to complete doctorate degrees. Utilizing numerous data sources, On Time to the Doctorate presents a new model to explain changes in both total time to the doctorate and in the several components of time to the doctorate. It examines the lengthening time to the doctorate in many fields (chemistry; physics and astronomy; earth, atmospheric, and marine sciences; mathematical sciences; engineering; agricultural sciences; biological sciences; health sciences; psychology; economics; and "all other social sciences") and provides theoretical explanations for this lengthening time. This thorough and current analysis of time to the doctorate provides an up-to-date, extensive review of the literature and an exposition of data not available elsewhere.

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