The US National Research Council has revised its influential rankings of doctoral programmes in the United States after it discovered "four substantive errors" in the data. The much-studied rankings were originally released last September, and marked a major rethinking of a system that had last been updated in 1995 (see Nature 467,510; 2010). Most programmes' positions have not changed much in the revision -but in some fields, such as astrophysics and astronomy, around a third of programmes have seen their position ranges on various metrics change by more than 10%.
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机译：美国国家研究委员会（National Research Council）在数据中发现“四个实质性错误”后，修改了其在美国博士学位项目中的有影响力的排名。受到广泛研究的排名最初于去年9月发布，这标志着对该系统的重大反思，该系统最近一次于1995年更新（请参阅Nature 467,510； 2010）。在修订版中，大多数程序的位置没有太大变化-但在某些领域，例如天体物理学和天文学，大约三分之一的程序看到其在各种度量标准上的位置范围变化超过10％。
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