楼上的回答不敢苟同。
1.没有人说的college就代表本科排名，即使指标里本科比重较大也不代表综合性大学排名就是本科教育排名，否则为什么把这些综合性大学和文理学院分开排呢？就是因为文理学院更注重本科教育从而影响排名的公平性。退一步讲，难道本科教育不应该是大学的重要组成部分吗？好的生源就是好的环境。本科即第一学历的好坏往往是别人第一眼先看的。
2.话不多说，直接上usnews官网原话，有时间的童鞋自己去官网一查就知：Schools in the National Universities category, such as Columbia University and the University of Pennsylvania, offer a full range of undergraduate majors, plus master's and doctoral programs. These colleges also are committed to producing groundbreaking research.
这段话就在国内综合性大学排名栏目下
3.Anyway,不论是national rank还是global rank都是一种排名的方法，孰优孰劣没有标准。如何选校在于你更看重什么。如果是研究生那么usnews的best graduate school也许是你更好的选择。因为专排往往比综排更重要。
补充作者：Jay Wong
链接：https://www.zhihu.com/question/26529817/answer/39454526
来源：知乎
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「3. How are the Best Global Universities rankings different from the Best Colleges and Best Graduate Schools rankings?
First, none of the data from the Best Colleges and Best Graduate Schools rankings are used in the Best Global Universities rankings, and vice versa. The Best Global Universities rankings are powered by Thomson Reuters InCitesTM research analytics solutions, whereas U.S. News collects all of its own data for the Best Colleges and Best Graduate Schools rankings.
Second, the methodology used to compute the Best Global Universities rankings is different in many key ways from the methodologies used for Best Colleges and Best Graduate Schools, because the global rankings focus specifically on schools' academic research and reputation overall and not their separate undergraduate or graduate programs.
It's true that all of these rankings use peer reputation surveys. However, the survey process used to compile and calculate peer assessment rankings in the Best Global Universities rankings relies heavily on evaluating institutions' research performance, as measured by bibliometric indicators such as publications, citations and highly cited papers. The U.S. NewsBest Colleges and Best Graduate Schools rankings do not use any bibliometric indicators.
Third, the Best Global Universities rankings contain 21 subject area rankings in fields such as clinical medicine, computer science and economics and business. The subject rankings measure a school’s global position in the field using data on global and regional reputation and academic research performance in that field, using citations and publications.
This is very different from our Best Graduate Schools rankings, where we rank medical, education, engineering, law and business schools, as well as Ph.D. programs in science and the social sciences and humanities. The Best Global Universities subject rankingsare not of academic majors, departments or specific schools at universities, such as business schools or medical schools.
This means that it's possible for a university to be ranked in economics and business without having a business school. The subject rankings show which universities worldwide are the leaders in key academic subject areas.」
这是来自於US News的官方解释，我就不翻译了，来自於http://www.usnews.com/education/best-global-universities/articles/rankings-faq#3
