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The United States National Research Council conducts a survey and compiles a report on United States Research-Doctorate Programs approximately every 10 years, although the time elapsed between each new ranking has exceeded 10 years. ==Methodology== Data collection for the most recent report began in June 2006; it was released on September 28, 2010. These rankings did not provide exact ranks for any university or doctoral program; rather, a statistical range was given. This was because "the committee felt strongly that assigning to each program a single number and ranking them accordingly would be misleading, since there are significant uncertainties and variability in any ranking process."〔"(A Data-Based Assessment of Research-Doctorate Programs in the United States: Frequently Asked Questions )" (2010). United States National Research Council.〕 Two series of rankings were offered: *The ''R-rankings'' were based on regression analysis. According to the NRC, this analysis was "based on an indirect approach to determining what faculty value in a program" and was done by first asking a sample faculty group to rate a number of programs in their area, and then using a statistical analysis "to calculate how the 20 program characteristics would need to be weighted in order to reproduce most closely the sample ratings." In doing so, the rankings "attempted to understand how much importance faculty implicitly attached to various program characteristics when they rated the sample of programs." Weights were assigned to each of characteristic varied by field.〔 *The ''S-rankings'' were survey-based: Faculty were "asked about the importance of 20 characteristics ... in determining the quality" of a type of program. Weights were assigned to determinant according to the results, varying by discipline. The factors included in these computations included〔"(A Data-Based Assessment of Research-Doctorate Programs in the United States )" (2010).〕 the number of publications per faculty member, citations per publication (except in computer science and the humanities), fraction of the faculty supported by grants and number of grants per faculty member, diversity of the faculty and students, student GRE scores, graduate student funding, number of Ph.D.s and completion percentage, time to degree, academic plans of graduating students, student work space, student health insurance, and student activities. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「United States National Research Council rankings」の詳細全文を読む スポンサード リンク
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