The new excellence indicator in the World Report of the SCImago Institutions Rankings (SIR) makes it possible to test differences in the ranking in terms of statistical significance. For example, at the 17th position of these rankings, UCLA has an output of 37,994 papers with an excellence indicator of 28.9. Stanford University follows at the 19th position with 37,885 papers and 29.1 excellence, and z = - 0.607. The difference between these two institution thus is not statistically significant. We provide a calculator at http://www.leydesdorff.net/scimago11/scimago11.xls in which one can fill out this test for any two institutions and also for each institution on whether its score is significantly above or below expectation (assuming that 10% of the papers are for stochastic reasons in the top-10% set).
翻译：《苏格兰机构排名世界报告》中的新的优秀指标使得能够检验统计意义排名的差异,例如,在排名第17位时,加州大学大学的成绩为37 994篇,优异指标为28.9。 斯坦福大学的成绩为19位,37 885篇,优异成绩为29.1篇,z=0.607。因此,这两个机构之间的差异在统计上并不显著。我们在http://www.leydesdorff.net/scimago11/scimago11/scimago11.xls上提供了计算器,其中可以对任何两个机构以及每个机构进行这一测试,说明其得分是否大大高于或低于预期(假设10%的首位论文中有10%是出于求知性原因)。
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